This massive circular sculpture may not be a portal to other worlds, but it does inspire the mind to imagine them.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Immortalized in bronze, this frazzled student will be glued to his screen for centuries.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

Its columns were all carved from the same white oak tree.

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

Kwanu'sila the Thunderbird has been silently watching over Chicago for more than 100 years (kind of).

How did a 2,000-year-old Roman column find its way to a Chicago park?

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

This 16th-century house tells the city's history through old artifacts and quirky tales.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

This early version of the guillotine was used to execute the man responsible for its construction.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

This mundane post marks the old location of the city's main postal hub.

The pockmarks across the building's facade are remnants of the Blitz.

A lone medieval church tower marooned among the City of London's skyscrapers

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

The remains of the great moral philosopher reside in a university in London.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

Numberless clock creates a meal of time for the dreaded, insectile Chronophage.