An Industrial Revolution-era public work that purified water using nothing but sand.

Final resting place of Typhoid Mary.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

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

This fascinating and poignant museum chronicles every imaginable aspect of Spanish colonialism in the Americas.

A unique exhibit lets blind people experience famous works of art and architecture with their hands.

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

This species of wild goat stars in witchy legends and frolics among the park's eerie rock formations.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

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

The little church's beautifully frescoed ceiling has earned it the nickname “the Sistine Chapel of Madrid.”

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

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

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

A town trapped in time - 1958 to be exact.

The loneliest island in New York.