Northern Ireland's Giant's Causeway amazes visitors with 40,000 hexagonal basalt columns; these can be seen along the coast near Bushmills.

Peru’s Nazca Lines remain one of the greatest enigmas in archaeology; to view these massive desert images, take a flight near Nazca or visit a viewing platform. 

Costa Rica's mysterious 'Diquís' stone spheres continue to baffle researchers to this day; visit 'Finca 6' in the Southern Delta today to see them.

The Moeraki Boulders in New Zealand look like massive extraterrestrial eggs; to take photos there, visit Koekohe Beach in Otago at sunrise.

The Pamukkale terraces in Turkey resemble waterfalls frozen in white stone; visitors can explore the nearby thermal pools and ancient Hierapolis.

Deep beneath the ground in Waitomo, New Zealand, it glows like a starry sky; take a cave boat tour every night beneath thousands of glowworms.

The Richat Structure in Mauritania, known as the "Eye of Africa," forms massive rings in the desert; to view it, head to the vicinity of Ouadane in the Sahara Desert.

Wyoming's Devils Tower rises upward with magnificent vertical columns; walk the monument's trails to view one of America's most formidable rock formations.

Antelope Canyon in Arizona is carved into shimmering sandstone waves; guided Navajo tours are the only way to enter safely.

Salar de Uyuni in Bolivia feels like another planet; visit the vast salt flats near Uyuni to witness mirror-like reflections after the rains.