Mysterious Incan ruins on a tiny island in Lake Titicaca.

A spectacular impact crater in the rugged heart of Central Australia.

The singular ruins of a mysterious lost city.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

Arguing within this idyllic, circular volcanic lake is forbidden.

This 17th-century Bhutanese monastery is ensconced in Buddhist legend.

The most remote tree in the world is more than 170 miles from its nearest neighbor.

This rural Sri Lankan village hides a cluster of small, enigmatic stupas.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

The largest market in Guyana, designed and built by the Edge Moor Iron Company of Delaware.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

One of the longest natural sand beaches in the world.

A forest park outside Tallinn full of architectural and artistic curiosities.

This elegant carving of the Buddha guards a small Buddhist temple within a cave.

A Kyiv-based repository for all manners of discarded curiosities.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Rows of multicolored bathing huts paint the sand dunes with pops of color.

A brilliant turquoise lake in the mountains.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

Where British troops serving on the remote islands paid tribute to their faraway hometowns.

An ornate tomb pays tribute to one of the most influential and cherished military leaders in Vietnam's history.

One of the biggest markets in Asia, under one of the continent's largest domes.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.