The first skyscraper to include a Ferris wheel built into the facade.

A memorial to an ill-fated Arctic expedition pursued by the U.S. Navy.

North America's largest accredited model railroad museum.

The largest collection of model trains in the world is actually run using full-size locomotive technology.

A model train wonderland hidden beneath Gare de l'Est station.

A comprehensive collection of toy and model trains, largely from the mid-20th century.

A site of pagan worship which still attracts people looking for fairies.

This observation tower is one of two of its kind that still exist in the United Kingdom.

Houses are tucked between, on, and underneath giant boulders.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

Internet rumors, often involving Icelandic singer Bjork, have abounded regarding this isolated outcrop of rock.

A centuries-old quest to create artificial life is alive and well in the French town of Limoux.

A unique work of automotive art calls this shopping center home.

An oddities shop that dabbles in the deathly and beautiful.

A Jenga-style cylindrical tower of books that appears to go on forever.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

A memorial dedicated to a highly decorated Marine and Korean War veteran, who also happened to be a horse.