The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

This Funeral Hearse Museum represents the finest in cadaver transportation.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

A beautiful but toxic fountain of mercury.

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

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

Numerical symbolism abound at East Asia's oldest observatory.

Wheels of chrome by the thousands adorn this California Historical Landmark.

A whimsical, punny collection of "fence art" outside the tiny mountain town of Baker, Nevada.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

360° views of the city plus five floors of optical illusions and hands-on science.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Neoclassical Revival mansion and set of horror cult classic Phantasm.

The only parking meter in the entire town, it is surrounded by 100 free spaces.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Enormous underground chamber built to detect 'ghost particles' of the universe.