This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Sniff the Titan Arum's rotting flesh.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

After the construction of a nearby cathedral obstructed the view, the oldest belfry in Belgium was more than doubled in height.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

The only quarter of the Old City not dedicated to a major world religion.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

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

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

An unusual round church in London with a Templar past.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

10,000 flowered plants bloom in the City of Roses.

Check out a shovel along with your Shakespeare.