Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The only surviving prototype for Buckminster Fuller's house of the future.

The only surviving prototype of Buckminster Fuller's revolutionary car.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

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

One woman's Viking Castle on Lake Tahoe.

The restored and active Victorian-era final resting place of San Francisco.

Gold Rush-era tombstones line the park's paths.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

Visible below the waves are memorials to the city's Gold Rush dead.

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

A vast city of the dead, where the deceased outnumber the living by more than a million.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The palatial McDonald's that inspired Wesley Willis.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This modest marker near Notre Dame identifies the very center of Paris.

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

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

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

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

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.