The face of the Colossus of Ramesses II at Memphis, Egypt, North Africa, Africa

Doorway Arch, Santa Maria da Vitoria Monastery, UNESCO World Heritage Site, Batalha, Portugal, Europe

Statue of Nuno Alvares Pereira, Santa Maria da Vitoria Monastery, UNESCO World Heritage Site, Batalha, Portugal, Europe

Colossi of Memnon, UNESCO World Heritage Site, Thebes, Luxor, Egypt, North Africa, Africa

Golden Buddhist statues in the limestone caves of Pindaya, Myanmar, Asia

Colossi of Memnon, massive stone statues of Pharaoh Amenhotep III in the Theban Necropolis, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

Limestone caravel shaped Padrao dos Descobrimentos (Monument to the Discoveries), Belem waterfront, Lisbon, Portugal, Europe

Great Sphinx of Giza, Pyramid of Khafre (Chephren) in the background, Giza Pyramid Complex, UNESCO World Heritage Site, Giza, Egypt, North Africa, Africa

Seated Pharaohs, Pylon 8, Karnak Temple Complex, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

The Great Sphinx of Giza, a limestone statue of a reclining sphinx, UNESCO World Heritage Site, Giza Plateau, West Bank of the Nile, Cairo, Egypt, North Africa, Africa

Located in the heart of the capital next to the Parliament Buildings, the Fairmont Chateau Laurier hotel is limestone edifice with turrets and masonry reminiscent of a French chateau, Ottawa, Ontario, Canada, North America

Parish Church of the Assumption of the Blessed Virgin Mary, also known as Church of Saint Mary, Mosta, Malta

The Great Sphinx and Pyramid of Khafre, also known as Pyramid of Chephren, Giza, Cairo, Egypt

Great Sphinx and Great Pyramid of Giza, also known as Pyramid of Khufu and Pyramid of Cheops, Giza, Cairo, Egypt

Carved Buddha statue, Fengxian Temple, Longmen Grottoes and Caves, Luoyang, Henan Province, China, Tang Dynasty

Inside Ny Carlsberg Glyptotek, Copenhagen, Denmark, Europe

Batu Caves, limestone caves near Kuala Lumpur, Malaysia, Southeast Asia

Magna Mater, statue, neolithic, megalithic Tarxien Temples, UNESCO World Heritage Site, Paola, Malta, Europe

Gold Buddha statues line the sides of the famous Pindaya Caves in Shan State, Myanmar. The cave is a common tourist destination and pilgrimage site for Buddhists.

The Great Sphinx of Giza, UNESCO World Heritage Site; Giza, Egypt

View of the Great Pyramid and Sphinx of Giza under a blue sky, Giza, Cairo, Egypt

The Great Sphinx of Giza, UNESCO World Heritage Site; Giza, Egypt

The Great Sphinx of Giza, UNESCO World Heritage Site; Giza, Egypt

Ha Long Bay, a tourist attraction, Unesco World Heritage Site; Ninh Binh Province, Vietnam

The Great Sphinx of Giza, UNESCO World Heritage Site; Giza, Egypt