This dreamy street will transport you to wintertime in Victorian England.

Dating back almost 400 years, the oldest public collection library in the United Kingdom was once the study hall of Karl Marx.

This Manchester laundromat is hiding something.

A 19th-century time capsule of travel, fiction, and historic texts still available to the public.

The oldest residential street in Europe also features an optical illusion.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

This supermarket offers shoppers a window into the past alongside their groceries.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

A lush indoor jungle fills this bustling Madrid transportation hub.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Legend says this sacred tree was a gift from goddess Athena.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

This miniature village stays behind in the Breuer Building, even as the museums around it come and go.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

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

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

The latest in a series of long glass bridges suspended at terrifying heights.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.