This beautiful building in the heart of Manhattan's Financial District was empty for decades.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

These enduring murals depicting a distinctly Marxist tribute to capitalism could not even be defeated by McCarthyism.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

The headquarters of the famous Yale society.

Connecticut grave of the woman responsible for the Winchester Mystery House in California.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Neoclassical bank designed by NY architects Helmle & Huberty.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

A bit of retro transportation flair preserved in the world's largest department store.

A posh members-only club with a literally dramatic history.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This Boy Scout retreat acted as "Friday the 13th"'s original Camp Crystal Lake.

You can spend the night as an honorary lighthouse keeper in this quaint, historic beacon.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."