Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

This small museum located under the famous cube houses, is home to some 30,000 chess pieces.

A remarkable cabinet of curiosities in an art space in the center of Berlin.

This ornate Weser Renaissance house was also the home of an infamous witch hunter.

A glimpse into the festive and private lives of medieval Europe.

The largest fountain in Bratislava.

A massive sculpture of an obscure Celtic coin that has become a symbol in Slovakia.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

The Grand Mall in Varna hosts one of the biggest collections of Soviet-era paraphernalia in Bulgaria.

These natural cliffs look like they are a part of an old castle complex.

Inside this small chapel tucked away in the forest is one of the most well-preserved Danse Macabre frescos.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This mosque turned crypt is an amazing display of Persian-Islamic architecture.

The colorful soil of Iran’s "Rainbow Island" attracts artists and nature lovers.

The most sacred Jewish shrine in Iran and a fine example of restoration works gone wrong.

This 17th-century structure is a beautiful testimony to traditional Persian architecture

One of the oldest monasteries in the world is a key pilgrimage site for both Muslims and Christians.

One of the oldest and largest castles in the world.