Early prototype for Frank Lloyd Wright's Guggenheim.

An eerie, derelict amusement park in Berlin.

Rebuilt remains of a temple to Roman god Mithras.

Remnants of a Victorian garden feature sitting in public woodland.

Abstract dinosaur models in London.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Eclectic final resting place of the controversial explorer.

The remains of a 12th-century chapter house in Golden Gate Park.

A storybook European village in Berkeley.

English antique dealers with a taste for the unusual.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Perfect your fly fishing technique on their practice ponds.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Hear the quietest sound from across the dome.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

This bridge was constructed from the rubble of the infamous Bastille.

When the imprisoned pope's remains were finally returned to the Vatican, his heart stayed behind in France.

Regency-era excess on the English Coast.

A monumental cross hides in the trees in Golden Gate Park.

A modern mechanical planetary system, part of a 10,000 year clock.

The anatomical-pathological collection of a man who changed surgery.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A cluttered and astounding collection of antiquities and curiosities.