A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

The unusual sculptures are believed to be powerful political symbols.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

This commemorative stone was erected near the first Scout campsite.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

A kaleidoscopic warehouse-maze of handmade neon signs.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

This educational institution and reference library specialize in the psychic arts and mediumship.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

A six-ton wedding present for the King of the Scots.

The final resting place of soldiers' loyal canine companions.

A castle in the Scottish Highlands has been continuously inhabited since the 1300s.

Copenhagen's celebrated theme park and gardens.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

3,000 market stands in five former Zeppelin hangars.

The reconstruction of this prominent building fulfilled a long-written command.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

The world's largest fully steerable radio telescope.

Take a steam-powered ride straight out of the past on this Appalachian rail line.