This garage is frozen in the late 1990s, full of rare and untouched cars and motorcycles.

After 400 years of being closed to the public, this monastery's underground tunnels and secret garden are now a museum.

Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

A brass and marble scale model of the solar system embedded in the concrete.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

The magic of Spanish aviation housed under one roof.

Once a resting spot for King Fernando VII.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

One of the best examples of the modernist movement in Madrid.

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

A must for film lovers in Madrid and home to the Spanish Film Library's projection space.

The Spanish king's private bathroom embraced the idea of a porcelain throne.

Nicknamed the "Spirit of Paul Klee," this colorful apartment building features an array of multicolored panels.

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

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

These abandoned country fairgrounds are filled with replicas of Spanish monuments.

A vault of safe-deposit boxes in an old bank has been repurposed as a time capsule of Hispanic culture.

Strange masks and obscure costumes are housed in this old Madrid corrala.

This Michelin-starred restaurant sheds light on a rare period of cultural and culinary tolerance in Cordoba’s past.

An eerie collection of the surviving structures from a past celebration of the future.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.