A beautifully eclectic mix of architectural styles.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Romania's triumphal arch looks out over Bucharest.

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.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Most prolific publishing house in the 1600s open to the public.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

A long, winding trek rewards you with a gorge so captivating it inspired a painting in the Tate.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

A Byzantine-era church hidden in a wooded area below the Acropolis.

Reputedly based on the tomb of Jesus Christ, this crypt is the oldest surviving structure of any cathedral in England.

These planks were originally installed to hold the dead.

The view that inspired the scenes of Dracula's first landing in England.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The little-known second castle that William the Conqueror built in York.