Explore the underground ossuaries in Paris, holding the remains of more than six million people
A pentagonal caravanserai-temple built over a natural gas vent, used by Zoroastrians and Hindu pilgrims.
Eighteen storeys cut into volcanic rock, deep enough to hide twenty thousand people and their cattle.
Tunnels carved for 18th-century defence.
Japanese guns on the island's high point.
Snorkel over WWII bulldozers and trucks the US Army dumped into the sea.
Walled city and ghostly Varosha.
Town beneath an active volcano.
Vivid 5,000-year-old cave paintings.
Renaissance castle built into the mouth of a cliff cave, with secret tunnels used by a robber knight.
The world's oldest and largest spaceport.
Ancient Islamic city of 82 mosques, where hyenas are fed by hand at night.
Cathedral-sized salt chambers with an underground lake and Ferris wheel.
Watch the sun rise along the Thirteen Towers of Chankillo, a 2,300-year-old solar calendar in the desert
Roman forum, Romanesque churches and the Sea Organ — steps that play music from the waves — on a Dalmatian peninsula.
Meet the thousand-year-old dead of Chauchilla, sitting in their open desert graves with hair and textiles intact
Rusting steam locomotives abandoned on the edge of the salt flats a century ago — a surreal stop on the way to the Salar.
Sail through a narrow gap into the flooded caldera of an active volcano, past a ruined whaling station and beaches warm enough to dig a hot bath.
Cross the last Inca rope bridge, hand-woven from grass and rebuilt by four communities every June
A chapel decorated with the bones of 40,000 people — chandelier included — beside the Gothic St Barbara’s Cathedral.
Fly over the Nazca Lines, giant desert figures etched into Peru's coastal plain two thousand years ago
The 1628 warship Vasa, raised almost intact after 333 years on the seabed.
Sunken Byzantine reservoir under Istanbul, its columns rising from black water.
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