These memorials built by an eccentric bachelor on the side of Interstate 5 cause both wonder and traffic accidents.

The tombstone of the founder of the lost town of Ogletown is now stuck inside a traffic median.

One of the oldest of its kind.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

God's Saharan sandbox of wrath.

Thousands of well-dressed mummies below a monastery.

The other side is actually green.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

Where America’s first doomsday cult awaited the end of the world.

Founded in 670, this ancient mosque is an architectural time portal.

A quarter mile off the coastal tip of Maine you'll find the "Beloved Island" of Franklin Delano Roosevelt.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

This grand gothic brewery has been pumping out suds for over a hundred years.

At 207 feet, one of the world's longest continuous escalators.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A toxic ghost town sitting atop a massive coal fire.

Iconic rock formations that allow for exploration during high or low tide.

Rusty red sands line the shores of this Canadian Province.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.