This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

Come for the flowers, stay for the bats!

This Australian beach is composed of tiny shells.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

Alien rock formations grown from the sands of an Australian national park.

One of the best beaches in the entire world.

An opal mining town in the middle of Australia where people live, worship, and shop underground.

A massive stairway that almost wasn't leads to one of Australia's most scenic vistas.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A beautiful geyser under environmental threat.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A hotel and restaurant serving as the mecca of kitsch.

Northern Ireland's Brobdingnagian stepping stones.

A fiery crater has been burning in the Karakum Desert since 1971.

Macabre astrological automaton clock dating to the late 1400s.

The atmospheric road was never meant to be so creepy.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Elevated freight railway turned wildly successful urban park.

France's most famous cemetery, with some of its most curious tombs.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.