In 2400 BC, two male hairstylists decided to spend eternity together. But maybe they were just friends?

Modest but unique pyramid built for a pharaoh has been reduced to a “heap of stone.”

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

The oldest Egyptian obelisk still standing in its original site.

A stunning fusion of Ottoman and Fatimid architectural styles.

An abandoned Byzantine fortress and notorious prison.

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

Once silenced for being off-key, this bell has found a new voice as an interactive public artwork.

Once a year, local students "clean" this statue with a champagne shower.

The enormous isokinetic structure hangs within a science center in Estonia.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

Mysterious craters may have been home to an ancient cult.

Inside this medieval church resides a unique set of murals.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

This atmospheric spot in Pärnu's historic old town is located in a 17th-century almshouse.

This hidden fortress has been coined the "City of Ghosts."

This Ukranian fortress is one of the best-preserved medieval castles in Europe.

This attraction was abandoned after the Chornobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This derelict superstructure was a very important warning system for the Soviet military.

A quirky collection flush with information on commode culture from ancient times to modern day.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

When you've got to go, you've got to go.

The deepest metro station in the world.