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

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.

Olfactory delights in San Francisco's Botanical Gardens.

Its buzzing collection honors vibrator history.

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.

This shop specializes in oddities and Victorian-inspired wonders.

A psychedelic labyrinth on the San Francisco bay.

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

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

Largest Roman Catholic church in North America.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

This London plaque marks the spot where David Bowie's famous alien made his debut.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

Orthodox church partially financed by Tsar Nicolas II.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

A hot dog stand where the heads are just as hot as the dogs.

These pretty kitties killed and ate as many as 135 railway workers.

A display of magnificent stained glass windows is the first exhibit of its kind.