The world's second-largest sundial, made entirely out of stone.

Witness to many historic moments in early Texas history.

On a dusty county road sit the ruins of a ghost town's abandoned church.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

The longest and widest floating bridge in the world.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

The bizarre headgear looks like it was made for a fool, not a king.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

One of the most well-preserved temples of ancient Egypt.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A public urinal so pretty, it was declared a national monument.

The largest known Ancient Egyptian obelisk.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

One of its engravings is believed to be among the first representations of medical and surgical instruments.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Ancient Egyptian relief, claimed to depict an electrical light.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

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