An unusual round church in London with a Templar past.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The morbid items in this small and hidden museum are not for the weak stomached.

When the water level in the Danube in central Budapest is low enough, there is a secret site telling the history of one of the most iconic bridges of the city.

This protected 19th-century façade once housed Mármoles Molina, a company specializing in funerary monuments.

Known as the Casa de las Siete Chimeneas, this haunted 16th-century manor has a dark, mysterious past.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Hidden under a center for the elderly are the dungeons which were used during the Spanish Inquisition.

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

The most emblematic piece by a Peruvian master of pop art ended up placed in a modest square in Alcorcón.

This small museum tucked within a subway station holds pieces from Madrid's past.

Commonly acknowledged as the only public monument to the Devil himself.

Likely the most colorful in the metro network, this mosaic was installed back in 1995.

An eclectic and whimsical building, the product of its creator’s imagination.

This weathered-looking portal is actually an exact replica of the entrance to the building where King Philip IV of Spain celebrated his honeymoon.

After decades of neglect in a municipal storage unit this medieval jewel was given a new life in the late 1950s.

The sculpture of a man sitting in the middle of the square holds great significance for the young nation of Kosovo.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

What happens when you cross a mayor and a painter?

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

With remarkable nonchalance, this modest park in Alcorcón brings Greek mythology and astronomy together

This is Bremen’s oldest historic district, famous for its labyrinth of narrow medieval alleys lined with tiny, colorful 15th-century houses that resemble beads on a rope.

A Nesting Doll of Churches.

A subterranean relic of the Spanish Civil War hides below this picturesque park.