This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

See massive fossils that are over 200 million years old in northeastern Arizona.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

The folks at the Devil's Rope Museum want you to get hooked on barbed wire history.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

The decaying remains of a once-luxurious Soviet spa town.

A monument to the thousands of Canadian soldiers who died capturing the French ridge during World War I.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

Founded as a refugee camp, now a popular tourist spot.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

These ancient ruins hide in plain sight next to a dessert shop.

This Ottoman-era church is hidden amid a busy tourist area.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

This building displays the scars of the “Dekemvriana,” a dark time in modern Greek history.

The home of Greece’s national poet sits crumbling in the middle of a popular tourist district.

The largest flower auction house in the world.

The location of the world's first telescope demonstration.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

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

This war memorial holds the remains of around 20,000 World War I soldiers from both sides of the conflict.

This graffitied 19th-century building was a prototype of European industrial architecture.