The only museum with its curator—and her pets—buried inside.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

An unusual ode to the late Irish playwright, complete with a squiggly bust and coffin-shaped bench.

London's smallest police station is barely the size of a phone booth.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

This unassuming alcove in London’s famous Tower Bridge once served to capture, store, and display dead bodies from the River Thames.

An architectural oddity hides in plain sight on this iconic London bridge.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

The Devil’s own choice when he needs a drink in Brussels.

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.

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

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Brussels' favorite peeing boy has a sister.