This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

The secret medieval communication system will whisk your words above the noise of the crowd.

A fountain standing as a testament to a doomed alliance.

Every Friday, Sufi dervishes whirl around the tomb in a trance-like state as part of a sacred ritual called dhikr.

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

The largest known Ancient Egyptian obelisk.

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

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

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

Ozymandias’ time-keeping temple.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

It took 82 years and four different plaques to finally get the story right.

Neoclassical Revival mansion and set of horror cult classic Phantasm.

The large collection of pre-Columbian pottery might make you blush.

An ancient stone fortress considered by many to be the eighth wonder of the world.

This mesmerizing architectural wonder will take your breath away with its unusual color patterns.

An impressive century-old, to-scale topographical map of Guatemala.

Ancient structures used to make and preserve ice in the deserts of Persia.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The unbelievably opulent home built for an infamous newspaperman.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.