This 11th century tower is said to be the oldest building in Oxford.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.

The oldest inn in England served brew to the crusaders.

The sanctuary seems to either float atop the water or sink into the dirt, depending on the water level.

This castle has links to Portugal’s founding and struggles for independence.

A museum in south England celebrates the amphibious vehicles that cruise on a cushion of air.

An abandoned masterpiece of Soviet Brutalist architecture.

The reconstruction of this prominent building fulfilled a long-written command.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

Liechtenstein's royal family calls this medieval alpine castle home.

Macabre astrological automaton clock dating to the late 1400s.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

The location of the world's first telescope demonstration.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

Touching the iron railings of Tarragona's balcony to the Mediterranean is said to bring good luck.

Bacteria and algae give the salty water its bubblegum hue.