People relaxing on the steps of the Cathedral (Duomo) at twilight with the Leaning Tower of Pisa (Torre Pendente) beyond, UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Torre Beach in Carcavelos, Lisbon region, Costa Verde, Portuguese Riviera, Portugal, Europe

Souvenirs of the Leaning Tower of Pisa (Torre Pendente) and of Roma, Pisa, Tuscany, Italy, Europe

Torre del Reloj Publico (Public Clock Tower), UNESCO World Heritage Site, Cartagena, Colombia, South America

Torre degli Anziani from the Via Marsilio da Padova, Padua, Veneto, Italy, Europe

Palacio de Belles Artes and Torre Latinoamericana, Mexico City, Mexico, North America

Torre de Madrid and Edificio Espana tower, Cervantes Memorial, Plaza de Espana, Madrid, Spain, Europe

Golden Tower (Torre del Oro), Seville, Andalusia, Spain, Europe

Torre del Oro (The Golden Tower), a dodecagonal military watchtower, Seville, Andalucia, Spain, Europe

View towards Via Roma, with the Torre Littoria in the background, from Piazza Castello, a prominent city square in the historic center of the city of Turin, Piedmont, Italy, Europe

View of Torre dell'Orologio and ornate lamp post in St. Mark's Square, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Torre del Oro (The Golden Tower), a dodecagonal military watchtower in Seville, Andalucia, Spain, Europe

Fountain at Puerta Jerez, wth the Torre del Oro in the background, Seville, Andalusia, Spain, Europe

View of Torre dell'Orologio in Piazza Tre Martiri, Rimini, Emilia-Romagna, Italy, Europe

View of Torre dell'Orologio in Piazza Tre Martiri, Rimini, Emilia-Romagna, Italy, Europe

Torre dell' Orso, Adriatic Sea, near Otranto, Lecce province, Salentine Peninsula, Puglia, Italy, Europe

View of Torre dell'Orologio e Porta di Mezzo and busy street in Taormina at dusk, Taormina, Sicily, Italy, Mediterranean, Europe

The colourful clock tower (torre del reloj) along the ancient city walls in Cartagena de Indias, Colombia, South America

View of Torre dell'Orologio e Porta di Mezzo and busy street in Taormina, Taormina, Sicily, Italy, Mediterranean, Europe

The Fitz Roy Massif in pastel pre-dawn morning twilight. Los Glaciares National Park near El Chalten, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America.

First light on Mount Fitz Roy and Cerro Torre in Los Glaciares National Park near El Chalten, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America.

Colorful clouds in the predawn sky over Mount Fitz Roy and the Rio del las Vueltas. Los Glaciares National Park near El Chalten, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America.

Mottled light and shadow on Mount Fitz Roy and Cerro Torre in Los Glaciares National Park near El Chalten, Argentina. A UNESCO World Heritage Site in the Patagonia region of South America.

Climber crossing the Latemar massif, fixed rope route, Dolomites, on the Torre Diamantidi peak, in the back the Rosengarten group, South Tyrol, Italy, Europe