An urban laboratory.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Is this the most Portland place ever?

This abandoned boat sits on a nude beach, is shaped like a UFO, and is covered in graffiti.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

The abandoned summer estate of the former Greek Royal Family.

A little-known park with unusual, half-ruined structures and a mystical energy.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

An abandoned Byzantine fortress and notorious prison.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

An acoustic anomaly with a mysterious cause.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

A huge musical instrument played by the ocean.

A psychedelic labyrinth on the San Francisco bay.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This shop specializes in oddities and Victorian-inspired wonders.

The only theatre in the world constructed specifically for sound movement.