A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Cat art as far as the eye can see.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

Romania's triumphal arch looks out over Bucharest.

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

A medieval church built up to defend its village.

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

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

Something's watching you.

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

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

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

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

A bit of the Berlin Wall was gifted to the Icelandic capital to commemorate the 25th anniversary of German reunification.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

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

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

Billed as the "largest natural flower garden in the world" this Middle Eastern show field has little competition at 45 million flowers.

Dating back to the 1800s, two imposing buildings in Michigan have had countless transformations over the years.

This log cabin gallery is one man's gnarly, hand-carved tribute to his favorite trees.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.