A peaceful place in the woods where everything is a work in progress.

Twenty-year effort to raise a castle using tools and techniques from the 13th century is now abandoned in the Arkansas woods.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

These muddy eruptions are less deadly than actual volcanoes but also more holy.

A mecca for India's Jains.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

Visit on a Sunday morning to see some killer tricks.

A record-breaking pool that uses computers to turn ocean water into cleaner, private swimming water.

A fake town founded by Western movie stars is now becoming a hip desert community.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

This half-finished "city of toys" was almost Italy's own Las Vegas.

Buried beneath the New Mexico sands are believed to be millions of copies of Atari's E.T. video game.

Ruins of an American Civil War iron forge still survive today.