Home to the "Circus" trees created by Axel Erlandson.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

360° views of the city plus five floors of optical illusions and hands-on science.

From scholastic to sepulchral - now under reconstruction.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

These fantastically named natural pools look like something out of a Scottish myth.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

A sculptor's dream castle turned fantastical ruin.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

An acoustic anomaly with a mysterious cause.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The longest hedge maze in the world.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Extraordinary sculpture garden created by an eccentric English poet.

The hallucinogenic center of the ancient world.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.