The only bicycle museum in the Netherlands charts the invention of the now-ubiquitous two-wheeled machine.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Atop this former dutch railway office sits an interstellar work of art.

Cycling around the Veluwe visitors are treated to a collection of stones from around the world.

Located inside Hoge Veluwe National Park, this museum began as the private collection of a prominent female art collector.

This large open-air museum showcases the ordinary lives of the people of the Netherlands and pre-industrial crafts and practices.

Organisms normally seen under a microscope decorate this church.

Romania's triumphal arch looks out over Bucharest.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

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

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

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

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This famous archeological mystery may be an ancient example of movable type.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

A set of beech hedges planted in the 19th century forms a tunnel that takes on a different appearance in every season.

Large collection from the 3rd millennium BCE.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This gigantic monument hidden in the woods was built to thank the Dutch for sheltering Belgian refugees during World War I.

At the base of this tower, a plaque marks the original center point of the Netherlands.