A muddy alien landscape that is home to rare species of exotic plants.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

A giant portrait of an ancient king looms over the river.

No one knows who built this strange cave of worship or exactly why.

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

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

A small town Romanian cemetery filled with darkly humorous gravestones.

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

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

This massive underground salt mine now holds a sci-fi theme park in its depths.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A little slice of Japan and its aesthetics in London's Holland Park.

Eighty million natural history specimens call this gargantuan museum home.

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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.