Parking garage where Bob Woodward met Watergate source "Deep Throat."

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

The caldera of this mini-volcano has been turned into a naturally heated mud bath.

An explosion of natural color known as "the river that ran away from paradise."

A naturally beautiful, seemingly bottomless deep blue spring.

Stunning wetlands ablaze with pink lotus flowers.

From dragonfruit to mangoes to durian this Thailand resort allows guests to stay inside all manner of giant fruit.

Bangkok's men with dangerous jobs come here in search of protective talismans.

Derelict airplane bodies serve as both home and income for three Thai families.

Modern design and unusual architecture make this mountaintop temple no ordinary Buddhist retreat.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

A mammoth pair of Civil War artillery guns abandoned out in the forest.

An abandoned stretch of highway, deteriorating next to the operational one.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

The first declared National Monument in the United States.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Former laboratory of radical psychiatrist Wilhelm Reich.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.