This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

One street divides a single town that stands in two U.S. states.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

A tiny chapel clings to a precipice above Germany’s gemstone capital.

The house's confection-like decorations are the result of one man's painstaking work over decades.

There’s a hidden military meme engraved on the World War II Memorial.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

Three markers installed over the course of 140 years mark the point where Arkansas, Missouri, and Oklahoma converge.

Icelandic folklore says this giant boulder was ripped from the mountains and placed at its current location, where it became home to elves.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Tiny memorials honor individual victims of the Holocaust.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

A Bhutanese temple gifted from the isolated Himalayan kingdom is now a surprising cultural gem located at the University of Texas at El Paso.

A celebrity from the late Cretaceous period.

The simple gravesite of a Romany clan leader is dotted with offerings, including cans of her favorite drink, Crush orange soda.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

There are eight natural springs around town, each with a slightly different taste.