A delightful but little-known public observatory and planetarium in Munich.

A small square plaque marks a failed assassination attempt that could have changed history.

The scars of World War II are preserved on its walls.

An abandoned train station in Munich constructed for the 1972 Olympic games.

The deserted pirate-themed restaurant still entices explorers.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

The little tuxedo cat survived the trip, then languished in obscurity.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The Sun King's military models, saved from the Louvre.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

This metro station doubles as an unintentional paleontology museum.

Visit an imposing 13th-century Transylvanian citadel lurking not far from the region's more heavily touristed attractions.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

Something's watching you.