One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This historic train station has been converted to a locomotive themed hotel.

Visit this playground of waterfalls, caves and sinkholes.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

Recovered from the brink of extinction, at home in the Financial District.

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

Golden Gate Park's historic collection of plants.

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

This turn of the century masterpiece has a mysterious goaty interloper.

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.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Hot Doug's "Hot Dog" Stand.

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.

A colorful square marks the heart of the city's LGBTQ community.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

Scattered around Atlanta are little doors with big charm.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

World's largest Christmas store.

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

The writing studio of an American adventure author, built in the style of a medieval castle.