A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

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.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

Something's watching you.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

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

This snug medieval lane is one of the narrowest streets in the world.

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

A medieval church built up to defend its village.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

A striking symbol of the Bulgarian capital.

An homage to the medieval rulers of Bulgaria.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A surrealist timepiece by the artist of melting clocks.

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

Indents in the pavement are all that remain from a grisly death machine in Paris.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

How did a French journalist’s grave become the sexiest statue in the cemetery?

A series of abstract, silly sculptures represent the works of a great modern classical composer.