One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

Elaborate tile work in this railway station tells the story of Portugal.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

One of the city’s oldest watering holes was originally the home of a famous James Brown (not that one).

Puerto Rico's oldest rum producer started its 140-year-old business with "a little barrel."

This colorful gate stands as an entrance to the walled city of Old San Juan.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

Revolutionary War casualties fill the only 17th century structure remaining in Manhattan.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

This simple Manhattan salt house is artfully shaped... well, like a giant granule of salt.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

Dine on dumplings at the oldest dim sum restaurant in New York.

Pay homage to a mysterious feline artifact outside of this Florida museum.