Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

Five miles of underground river link lake to ocean.

This experimental utopian "city of the future" in rural India may hold a dark secret.

The platform atop this verdant volcano was built with the help of a royal elephant.

This elaborate temple was built around one of the Buddha's teeth.

Roman ruins top white travertine terraces formed by ancient hot springs.

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

Highly spherical boulders on the shores of New Zealand.

The premier place to experience the Victorian imagining of the steam-powered future.

A perfect turquoise lake colored with glacier dust.

A glacier pocked with ice caves and surrounded by rainforests.

The glacier tucked within a New Zealand rainforest.

A New Zealand couple's shell-adorned home living room, now on display at the Canterbury Museum.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Some of the clearest water anywhere in the world.

This deadly little sliver of beach has seen hundreds of whales beach themselves over the years.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

Monument to a brutal, ineffectual US bombing campaign and a sobering reminder of the human cost of the Vietnam War.

The notorious "Hanoi Hilton" where Vietnamese colonial subjects and later American POWs, including John McCain, were imprisoned.

A former French military respite turned jungle tourism hotspot.

A desert in southeast Asia, complete with a beautiful lake covered in lotus flowers.