The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A snapshot of the city's fascinating voodoo culture.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The final resting place of New Orleans' most famous voodoo priestess.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Volunteer-run library dedicated to exploring five decades of activism history.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Nondescript elevator doors open to reveal a stunning, surreal world.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

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.

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

The famous author's cottage hideaway.

A bronze ballot box stands at the spot where Susan B. Anthony voted illegally.

A room hidden behind a swinging shelf in the children's section.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.