The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

A massive Montreal stadium that has seen nothing but trouble since its inception.

"If she'd leave us alone, we would have a happy home, sent from down below."

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

An essential stop before plundering, BYO Cutlass.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The Habsburgs' royal collections of art and wonders.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A winding path built in secret on the edge of the continent.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Op-art architecture designed for happiness.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.