Geometry and mystery come together in an epic show of octagonal masonry.

The construction of a new church near Venosa was started in the 11th century, but never finished.

A spiritual sanctuary in a natural cave.

This foolish Victorian sea fort was converted to a deluxe hotel.

This shell of a historic manor house on the Isle of Wight is said to be the most haunted site on the island.

The world's oldest operational public pier railway has shuttled seagoing commuters from ship to shore since 1909.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The attic of a four-century-old canal house hides a clandestine church.

There are two dozen tanks just sitting in an open field in Lower Saxony.

This former steel and coal plant is now a neon-lit industrial fantasia.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

This steel frame is a skeletal mirage of a lost 16th-century stone building.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

Building Men of War and Indiamen from Holland's Golden Age.

Wind power station for making famous Ketel One vodka.

A statue of the second-tallest Dutchman in history.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

A miniature city, once ruled by the Queen of the Netherlands.

A grassy pyramid named after a French battle.

A lecture hall sink once used by Einstein and other noted physicists is now regarded as a strange science relic.