A haunted slate mine turned concert hall and a hidden fairy garden.

A curious urban windmill once owned by a renowned British mathematical physicist.

In 1977, an eccentric book lover formed a micronation for book lovers.

According to local legend, the devil shattered this column after losing a bet.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

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

Romania's triumphal arch looks out over Bucharest.

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

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

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

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

This once-derelict building is now one of the most beautiful bookstores in the world.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

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

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This 19th-century aqueduct provides insights into how water was supplied to Victoria on the island of Gozo before modern plumbing.

An 18th-century hunting lodge turned haunted Baroque palace.

The first regular high-definition TV transmissions were made from this seemingly out-of-place mast located on one corner of a Victorian-era entertainment venue.

Many mysteries surround these objects questioning whether they are cannonballs at all.

The oldest standing building on Merseyside is special for its rich history as a Benedictine monastery and its unique connection to the origins of the Mersey Ferry.

Some of the most enduring novels in English literature were written within the walls of this Georgian-era building.

This gate served as a small lock-up jail in the 14th century.

A collection of windows created by two of the foremost leaders in the British Arts and Crafts Movement.

The unpredictability of this pendulum's movements has drawn visitors to this magnificent church for decades.