It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

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

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

Eighty million natural history specimens call this gargantuan museum home.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Gargoyle head that brings good luck.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Sweden's "good old days" painstakingly re-created in a model village.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

It houses the remains of a 17th-century version of the Titanic.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

It's good luck to be mocked by this monkey.

This restaurant's specialty is "a major enigma for food historians."

Carved fountains poignantly placed in parks and in front of special monuments.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Visitors dip into a variety of pools of what was once ice.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

A little sculpture with a large wardrobe.

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

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This curious, round temple is the oldest still-standing marble building in Rome.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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