The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The tallest hotel in Europe.

The deepest metro station in the world.

This demon atop the Notre-Dame de Paris looks utterly bored.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

Today, Kent's medieval monarchs hold court on a busy pedestrian thoroughfare—or at least their statues do.

This skewed English house has looked like it's going to fall over for centuries.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.

Flying high, this unusual hornet statue celebrates the local soccer team formerly owned by Elton John.

The longest cutting on the M62 contains some surprises—though it's best to leave the motorway to appreciate them.

The house in the middle of the motorway.

The tallest freestanding structure in the United Kingdom.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

This Underground station has been a popular filming location for decades, even before it closed.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.