Lavish royal estate punctuated with heated greenhouses.

When the plague struck York, this stone was used to leave supplies for the sick.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

When you're a great Russian Tsar, even your vomit gets a statue.

A wonderfully kitsch bookstore the size of a supermarket.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Cozy basement bar sports an inventory of over 2,000 beers.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

The final resting place of the world's first nuclear reactor.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

At 22 feet tall, these Bronze Age monoliths are some of the tallest standing stones in the United Kingdom.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

This print shop boasts one of the largest pinball arcades in San Francisco.

A hidden subterranean installation offers a view of the sky.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

San Francisco's newly reopened hands-on science museum.

America's oldest Italian restaurant is a San Francisco institution.