These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

The unfinished final resting place of some of Spain's most prominent politicians.

Five million people are laid to rest here, more than the population of Madrid itself.

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

An exact replica of a colossal Olmec head sits atop a pyramid within a Madrid traffic circle.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

The earliest known map to show America, discovered by accident at a Paris bookshop.

Where royalty waits in the height of luxury.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A set of seven houses, each built in a style that represents a European country.

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

The cutest way to stay safe in traffic.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

The remains of a convent turned military barrack in the heart of Madrid.

The last two abbots of this monastery were both executed by Henry VIII.