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

San Francisco's newly reopened hands-on science museum.

Tiki luxury on Nob Hill.

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

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

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

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

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

A huge musical instrument played by the ocean.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This hotel was the site of major events in sports and radio history. It was also used as a detention center during World War II.

Regency-era excess on the English Coast.

Hundreds of personalized inscribed planks make up this historic boardwalk.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Metro station with a claim to rock n' roll fame.

A restaurant and observation deck built in a unique broadcasting antenna.

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

According to local legend, a tree grew from the stake that killed this alleged vampire. In reality, he probably died from influenza.

See six states from the newly restored 100-year-old historic roadside attraction.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."