San Francisco’s century-old Christmas Tree.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Only hotel where you can legally launder money.

Furniture tries to escape an abandoned building in San Francisco.

Most-visited and most-photographed slot canyon in the American Southwest.

A museum dedicated to the alleged Roswell Incident.

This is one really big nut.

This giant shopping mall still holds signs of its automotive past.

An extensive collection of ancient Egyptian artifacts and mummies.

The headquarters of a secretive order is also a beautifully-designed park.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

An emerald-green grotto just a short trip from Austin.

A popular swimming hole that hides one of America's most deadly diving spots.