Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

An archaeological treasure trove towers over the valley of Chiavenna.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

A medieval fountain lined with 99 unique stone faces whose origins and meaning remain unknown.

This charming railway is one of the oldest and steepest funiculars in England.

The world's first interactive human body museum also serves as a chair for a giant orange man.

The medieval network of canals hidden underneath the city is opened to explorers each year.

The longest hedge maze in the world.

Houses are tucked between, on, and underneath giant boulders.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

Natural cathedral designed by Italian artist Giuliano Mauri.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Artwork tucked within the trees greets visitors with surreal sonic experiences.

When it came to designing his own small office building, the eccentric architect wasn't afraid to show the world what he could do.

A bike train runs along a disused railway line through the tranquil French countryside.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Curious carved stones and bird-like wings are a symbol of Serbian resilience and freedom on the site of a WWII massacre.

Something's watching you.

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Though they've since been renamed, these two streets hint at Dublin's darker days.