This private residence was the template for one of the most beloved television homes of all time.

Golden Gate Park's historic collection of plants.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The celebrated eyesore created by starry-eyed sweethearts.

This Parisian gem is one of the most incredible ethnographic museums in the world.

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

The ritual has been performed uninterrupted for nearly 700 years.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

Pop culture has helped to keep this iconic British building from being destroyed.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Tubing through a cave lit with glowworms is a magical underground experience.

The platform atop this verdant volcano was built with the help of a royal elephant.

Come for the flowers, stay for the bats!

This replica of the Greek structure is in the heart of Nashville.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

One of corporate America's best-kept secrets is also one of the most publicly displayed.

Buy your fish and have it cooked to order in this bustling, eight-floor seafood market.

The world's largest collection of the world's largest objects is in one small Illinois town.