The rogue roots are gradually consuming some of the historic marble grave markers.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

The narrowest house in America is seven feet of pure spite.

The resting place of a Civil War celebrity's amputated limb.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The hallucinogenic center of the ancient world.

This large, circular tomb is the final resting place of the first emperor of Rome.

The world-record holder for the longest bridge stretching continuously over water.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

The best-preserved ancient theater in the world.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

This famous archeological mystery may be an ancient example of movable type.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A charming beach town in Turkey captures all the colors of the rainbow.