A beautiful maze marks where three countries meet.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Abandoned castle was once a grand example of Russian privilege, built exclusively to win a frivolous bet between noblemen.

Twisted buildings adorn the banks of the Rhine river.

A Spanish artist builds his own castle.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Norway's oldest cathedral still in use.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

An exquisite tunnel of cascading flowers.

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

"Alleys of Stone" form natural mazes in Spanish natural park.

A collection of decorative eggs to admire in the off-season.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

A fairy tale castle in modern Rome.

Nine Gardens in one—with tea service.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A grand example of 19th century Burmese teak architecture, and the most significant of Mandalay's historic buildings.

A former milk-delivery driver and his wife turn their home into a glimmering mosaic.

This outsider art house has gone from clinical creation to astounding artwork.

66,000 pieces of art, donated by one of the world's richest men.

A total of 999 stairs lead visitors through a massive hole in a mountain known as the Gateway to Heaven.