The scars of a remarkably organized public protest to save 13 elm trees are still visible in this Stockholm park.

18th century opera in its original splendor.

This luxury hotel suite is located deep in the bowels of an old mine.

A Chinese meditation center in the middle of rural Sweden, partly funded by a member of ABBA.

This micronation's flag honors its favorite drink, Kaffegöken, or "cuckoo-coffee."

Copenhagen's celebrated theme park and gardens.

Swedish skyscraper with a 90° twist.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A peat bog in southern Sweden provides a cozy and photogenic home for junked Volvos, Saabs, and the occasional American muscle car.

These mysterious circular formations are actually remnants of 19th century gristmills.

This pyramid in southern Sweden houses the remains of an eccentric nobleman, who spent his life doing whatever he felt like doing.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

A former hen house turned curiosity cabinet displays one man's lifelong fascination with cannibalism.

A memorial to a Swedish hockey player's "encounter" with aliens.

Micro-nation based around a nine-story high illegally built tower.

Dedicated to a song so popular the request to "Play Shoreline" became part of Swedish culture.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

This stunning concert hall has become a symbol of Iceland's national recovery.

A sulfuric martian landscape that looks far better than it smells.