This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The quintessential Japanese rock garden has existed for more than 500 years.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

This bridge is haunted by the ghost of a distraught mother.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

Not-so-fearsome tiny trolls live under this wooden train trestle in Portland.

Shrine to Japanese water-goblins, complete with their preserved body parts.

This replica of the Greek structure is in the heart of Nashville.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A house carved into a rock in the 1940s.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.