St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Disused penal colony features prisoner artwork, some sketched in human blood.

This Costa Rican topiary park is a surreal garden of unearthly delights.

A mesmerizing disco ball-like sculpture along the Sacramento River Walk.

I Street Bridge is the heaviest swinging center bridge in the United States.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

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

This graffiti-covered bridge is the quintessential vision of a place for disillusioned youth to escape the complexities of burgeoning adulthood.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Dubbed the "smallest church in America," this tiny sanctuary was a local grocer's dream come true.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The world's second largest single-dish radio telescope, once used to contact E.T.

The world's brightest bioluminescent bay.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

This enormous abandoned prison was once dubbed the "Bastille of Romania."