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

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

Olive’s garden serves up a seemingly endless helping of outback delights.

Curious crater remnants in the middle of the Australian outback.

An incredible garden taking over the interior of a massive sinkhole.

It's beautiful, it's haunted and its claim to fame is that it's the oldest existing stone arch bridge in Australia.

A small troop of Japanese macaques live peacefully in the heart of this Tasmanian city.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

An active seahorse farm is currently saving Tasmania's handfish from extinction.

Aqua white sand highlighted with fiery red rocks.

One of the best beaches in the entire world.

This historic Australian bridge was built by convicts with giant stone spikes to prevent cattle from falling off the sides.

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

It's said that visitors can "see" Tasmania inside this cave.

This extraordinary geological oddity resembles human-made pavement.

A natural rock bridge towers above the sea.

This controversial museum includes such detested exhibits as a chocolate suicide bomber and fecal-smelling digestion machine.

This small seaside reserve supposedly inspired a young Errol Flynn to take the nautical adventures that would define him on and off the silver screen.

The world's only full-size replica of the research hut used by Douglas Mawson for his 1911-14 Australasian Antarctic Expedition.

One of Ayutthaya’s most iconic locations is a mysterious, hauntingly surreal miracle.

Monkeys lounge around at this 13th century temple.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.