This small church was constructed over the ruins of three temples dating to the Roman Republic.

This is the oldest Roman-made bridge in the city still existing in its original state.

Breathtaking and huge 430 year old maps of Italy.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

One of the few working locomotive roundhouses in the United States.

The only surviving prototype for Buckminster Fuller's house of the future.

Perhaps the most spectacular grotto along the Algarve coastline.

The site of Martin Luther King Jr.'s arrest as he attempted to have lunch.

These paved rills bring freshwater into Altstadt and could spell wedding bells for whoever stumbles into the waters.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A stonemason's hilarious revenge came in the form of this peculiarly positioned gargoyle.

This Late Gothic building that once housed Erasmus is now known as the filming location of "Suspiria."

One of England's most famous churches hides a pair of little known architectural treasures.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.

The lake that fills and empties itself at random.

A beloved upside-down beacon off the coast of Northern Ireland.

Northern Ireland's Brobdingnagian stepping stones.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

The oldest house in Glasgow is now a museum dedicated to the city's medieval history.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."