The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A very classy 1920s-era bar right in Grand Central Station.

Elevated freight railway turned wildly successful urban park.

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

Read a book next to a Midtown waterfall.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

An early 20th-century bullring converted into a modern shopping center.

The colonial city's social history is reflected in its fanciful door knockers.

In the back of a nondescript sports bar is a museum-worthy mural by legendary cartoonists.

This neighborhood grocery houses a treasure trove of Eastern European delights.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

The ruins of this medieval castle now stand as a monument against all wars.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

This church carved into the rocks is full of enchanting stone statues.

Storms, funding, and in-fighting have kept this Bermuda church from ever being completed.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The world's smallest drawbridge.

100 massive sculptures in the Hudson River Valley.

Waterway populated with abandoned projects, including a submarine.

This small, hidden cove is home to abandoned boats.