Italy
Underground caverns where a single shaft of daylight illuminates a cathedral-sized void beneath Puglia.
A shaft of daylight falls through a sinkhole into a void the size of a cathedral nave, lighting formations that have grown in darkness for millions of years. The underground air is cool and mineral, smelling of deep earth. Your voice disappears into chambers that open one after another like rooms in a stone palace.
The Castellana caves run beneath Puglia's Murge plateau, entered since 1938, when the speleologist Franco Anelli dropped through the sinkhole locals called the Grave and found the system waiting below. Guided routes run a shorter circuit or the full three-kilometre journey to the Grotta Bianca, a chamber of pure white calcite counted among the most dazzling cave rooms in Europe. The temperature holds constant around 16 degrees whatever the month, which makes the caves one of the few Puglian spectacles improved by an August heatwave. Above ground, the town gets on with its market-day life, unbothered by the cathedral under its feet.
Family
Children who fidget in museums walk open-mouthed through chambers of stalactites; the shorter circuit fits younger legs exactly.
Friends
Book the full route together; an hour of ever-stranger chambers builds to the White Cave like a shared secret.
Bombette, little pork rolls seasoned with rosemary and pepper, come straight off the butcher's grill.
Fresh cavatelli and strascinati are rolled daily in the Murge tradition, sauce optional but foolish to skip.

Salinas Grandes
Argentina
A salt flat so white it dissolves the horizon, cracked into hexagonal tiles.

Drumheller
Canada
Hoodoos, coulees and the world's dinosaur museum share a badlands valley cut through wheat country.

Tottori Sand Dunes
Japan
Wind-rippled dunes rise above the Sea of Japan, with camel rides across the sand.

Cenote Dos Ojos
Mexico
Beneath the forest floor, two clear pools open into a drowned cave world.

Cascate delle Marmore
Italy
Romans sent a river over a cliff in 271 BC; the thunder still obeys a timetable.

Etna
Italy
Europe's tallest active volcano, lava fields, sulphur vents, and vineyards growing in volcanic ash.

Verona
Italy
A Roman arena still hosting opera under summer stars, the balcony just the excuse to come.

Alberobello
Italy
A district of conical stone huts built without mortar, a village from a folk tale.