A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

Besides being home to cave paintings and pre-Columbian Cuban archaeological remains, you get to take a boat through this stalactite and stalagmite covered cave.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

More than 20,000 salt and pepper shakers from across the globe call this museum home.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A little theme park full of miniature monasteries and churches, made by hand.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Legend has it that Napoleon Bonaparte fell in love with this Gothic church.

This micro-nation may be some sort of prank, but its constitution sure seems official.

This 15th-century Serbian Orthodox monastery also contained a school for illuminating manuscripts.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

One of the most controversial statues in Romania is an emperor with no clothes.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

This fortress-like monastery is covered with intricate frescoes.