Op-art architecture designed for happiness.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

A tribute to the first human in space.

The bridge that cost Germany a World Heritage Site.

An unsettling sculpture of a boy hanging out in a street in Ghent has been baffling visitors for years.

This watchtower once presided over the Berlin Wall.

A 315-foot spire jutting out from the Blue Ridge Mountains makes for breathtaking views.

A unique, free-floating electric ferry may be the only of its kind in Europe.

The first, and perhaps only, monument dedicated to Wikipedia.

An abstract and eyecatching clock/fountain is the centerpiece of this little-known German city.

This unique medieval artwork featuring the story of the Antichrist remained lost for decades.

Only a fragment of this 15th-century Dance of Death survives today.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

Finland's oldest astronomical observatory once played a crucial role in seafaring and timekeeping.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

An alien church provides much needed silence in the midst of a Finland shopping center.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

The final resting place of soldiers' loyal canine companions.

This former train tunnel is filled with lines from a poem crafted by Robert Louis Stevenson.

A remarkable feat of Victorian engineering across the Firth of Forth.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

The main residence of the Erskine family and the hereditary keeper of the nearby royal Stirling Castle.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.