One part local history, 99 parts gruesome haunted house.

Kingly French toast comes soaked in milk or red wine, then drizzled in a citrus-perfumed syrup.

This piece of early engineering is rather unknown despite its location in the heart of Madrid.

Inaugurated three times, this tower offers some of the best views of Madrid.

Once a resting spot for King Fernando VII.

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

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

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

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

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.

A model solar system adds a celestial touch to this suburban park.

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

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

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

A scientific repository of goiters, boils and other ailments throughout Mexican history.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

A quirky and charming restaurant founded by artists.

Twelve natural mummies are displayed in the crypt of this former monastery school.

A church dedicated to the Mexican skeleton saint.

An island filled with hundreds of hanging, decomposing, decapitated dolls.