The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

An abandoned faux-pub made famous by a Guinness commercial.

Petrified footprints of one of the very first vertebrates to walk on land.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

The 19th-century home of Count and Countess von Hallwyl is now a museum.

Sweden's "good old days" painstakingly re-created in a model village.

A fine, large-aperture telescope available for public use.

The highest point in Washington state is a volcano covered in glaciers.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

England's most notorious suicide spot.

This giant geoglyph of mysterious origins is now the site of neo-pagan rituals.

A fantastic castle rumored to be the birthplace of King Arthur.

One of the largest legal spray spots in Hamburg.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

Hiding the longest subterranean river known in the world.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

This Dutch statue is a monument to the fictional shrew who brought doom to the city of Stavoren.

While most bridges allow roads to pass over water, this one allows water to pass over a road.

The Netherlands' first car tunnel has an unusually rectangular shape.

This artificial ring island was built to hold cubic tons of polluted dirt.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

Wind power station for making famous Ketel One vodka.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.