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Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

White travertine basins at sunset, Pamukkale, UNESCO World Heritage Site, Western Anatolia, Turkey, Asia Minor, Eurasia

White travertine basins, Pamukkale, UNESCO World Heritage Site, Western Anatolia, Turkey, Asia Minor, Eurasia

White travertine basins, Pamukkale, UNESCO World Heritage Site, Western Anatolia, Turkey, Asia Minor, Eurasia

Terraces of calcite travertine forming the Dunn's River Falls, near Ocho Rios, north coast, Jamaica, West Indies, Caribbean, Central America

Town Hall and Travertine fountain sculpted by Filippo Brigioni in 1727, Nepi, Viterbo, Lazio, Italy, Europe

Town Hall and Travertine fountain sculpted by Filippo Brigioni in 1727, Nepi, Viterbo, Lazio, Italy, Europe

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Puente del Inca natural bridge of travertine, near Mendoza, on Argentine side of Libertadores Pass over Andes, Argentina, South America

Tomb on travertine rocks in the Necropolis of ancient Hierapolis, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

White travertine basins at sunset, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Palette Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Canary Spring, Travertine Terraces, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Travertine pools and terraces of The Cotton Castle of Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Asia

Castel Sant'Angelo and St. Peter's Basilica from the River Tiber at night, Rome, Lazio, Italy, Europe

Castel Sant'Angelo and Ponte Vittorio Emanuelle II on the River Tiber at night, Rome, Lazio, Italy, Europe

Ponte Sant'Angelo on the River Tiber and the Castel Sant'Angelo at night, Rome, Lazio, Italy, Europe

S.t Peter's Basilica and the colonnades of St. Peter's Square (Piazza San Pietro), UNESCO World Heritage Site, Vatican City, Rome, Lazio, Italy, Europe

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hot Springs on a hill of travertine covered in snow, Mammoth Hot Springs, Yellowstone National Park, Wyoming, United States of America, North America

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Natural spring, Pamukkale, UNESCO World Heritage Site, Egee region, Anatolia, Turkey, Asia Minor, Asia

The world's finest travertine dams, Huanglong (Yellow Dragon), UNESCO World Heritage Site, northern Sichuan, Sichuan, China, Asia

Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Terraced travertine thermal pools, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Terraces of calcite travertine forming the Dunn's River Falls, near Ocho Rios, on the north coast of Jamaica, West Indies, Caribbean, Central America

Gleaming white travertine terraces, nicknamed Cotton castles, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Travertine calcite deposits, Minerva Terrace, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

White travertine terraces at Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Travertine calcite deposits on the Canary Spring terraces, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

White travertine terraces at Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Travertine terrace formations, UNESCO World Heritage Site, Pamukkale, Denizli Province, Aegean Region, Turkey, Asia

Sinter terraces with calcareous tuff deposits, hot springs, colorful mineral deposits, Palette Springs, Lower Terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, North America

Dead trees on sinter terraces, hot springs, orange mineral deposits, Palette Springs, Upper Terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, North America

Aerial view, sinter steps, sinter terraces, lime sinter terraces, Egerszalok, Egerszalok, Eger, Heves, Hungary, Europe

Erupting Pohutu Geyser with rainbow, sinter terraces, Te Puia, Whakarewarewa, Rotorua, Bay of Plenty, New Zealand, Oceania

Liberty Cap, extinct travertine cone geyser, Canary Spring Terrace, limestone sinter terraces, geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Sinter terraces with calcareous tuff deposits, hot springs, colorful mineral deposits, Palette Springs, Lower Terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, North America

Sinter terraces, hot springs, orange mineral deposits, Palette Springs, Upper Terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, North America

Aerial view, sinter steps, sinter terraces, lime sinter terraces, Egerszalok, Egerszalok, Eger, Heves, Hungary, Europe

Fontana del Tritone, by Gian Lorenzo Bernini, in travertine, 1642 - 1643, Piazza Barberini, Rome, Italy, Europe

Chiostro Maggiore di San Francesco, cloister of the church St Francis, built in 1565 - 1623 in travertine, Ascoli Piceno, Marches, Italy, Europe

Detail photo, hot spring with orange mineral deposits and algae, Palette Springs, Upper Terraces, Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA, North America

Thermal waterfalls, travertine pools, Cascate del Molino, Saturnia, Province of Grosseto, Tuscany, Italy, Europe

Typical ancient building in travertine, Corso Vittorio Emanuele II, Ascoli Piceno, Marches, Italy, Europe

Chiostro Maggiore di San Francesco, cloister of the church St Francis, built in 1565 - 1623 in travertine, with a well in its center, Ascoli Piceno, Marches, Italy, Europe

The Plitvice Lakes in the National Park Plitvicka Jezera in Croatia. Visitors taking a cruise on lake Kozjak. The Plitvice Lakes are a string of lakes connected by waterfalls. They are in a valley, which becomes a canyon in the lower parts of the National Park. The waterfalls are formed mostly by travertine (tufa) barriers between the lakes. The lakes are listed as UNESCO World heritage and are visited by close to one million tourists per year. Europe, South Eastern Europe, Croatia

Orvieto, Umbria, Italy, during a late spring sunset. Orvieto is noted for its Gothic cathedral, or duomo. The church is striped in white travertine and greenish-black basalt in narrow bands; its design has often been attributed to Arnolfo di Cambio, but the prevailing modern opinion is that its master mason was an obscure monk named Fra' Bevignate from Perugia; construction began in 1290.