Original cabaret handbills, posters, and feline artwork are a purrfect highlight of the Museum of Montmartre.

The classic Atari game's iconic aliens have invaded downtown San Diego.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

The world’s largest Masonic temple was saved by the White Stripes.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

Beautiful Victorian buildings from L.A.'s forgotten architectural past.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

Dr Barnes' $25 billion private collection of art and arboretum.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

Strange, gentle beasts resembling goat-cow hybrids roam within this patch of forest.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

The potters' quarter is packed with artists sculpting clay gods with mud from the sacred Ganges river.

Once the site of speeding horses, now home to picnickers and public concerts.

A century and a half of research in the sciences and natural history, still going strong.

One time home to turn of the century explosives, now hidden under the Bay Bridge.

San Francisco's first World's Fair, dedicated to the wonders of California.