An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

Model Trains and Much More in Hamburg.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A student driver's nightmare.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

An incarceration museum on the spot of possibly the oldest prison in England.

Hear the quietest sound from across the dome.

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

The curios of pharmacist and collector Henry Wellcome.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

One part local history, 99 parts gruesome haunted house.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

France's most famous cemetery, with some of its most curious tombs.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.