The first and only carousel with a lineup entirely of insects.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A dilapidated dock tells the story of Titanic's missed arrival.

A graffiti Mecca welcoming artists from around the world.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

New York City's smallest piece of private property.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Elevated freight railway turned wildly successful urban park.

A crumbling hospital from the 1850s on Roosevelt Island.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Dr Barnes' $25 billion private collection of art and arboretum.

World's first "penitentiary," meant to be humane, drove men insane.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.