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

The tallest mountain in mainland Netherlands isn't actually very tall.

A historic Civil War estate-turned-museum looks back on the Confederate States of America.

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

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

This ancient settlement contains some of the largest earthen mounds in North America.

An ancient Egyptian obelisk is now used to commemorate fallen Italian soldiers.

Bronze statue marks the spinach capital of the world.

Where Elvis Presley received his first Army buzz cut.

The remains of a World War II-era Japanese American internment camp dot a windswept Colorado hill.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

World's smallest skyscraper, the product of a remarkable con.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

This huge clock made of flowers and simple machinery was once used a political weapon.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

Unique tower has outlasted a takeover of the company.

A pharmacy built in the shape of a mortar and pestle, now resembles a fancy cocktail.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This is the oldest Roman-made bridge in the city still existing in its original state.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.