Canyon walls shrouded in ferns.

Rebuilt remains of a temple to Roman god Mithras.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

This grand gothic brewery has been pumping out suds for over a hundred years.

The largest of London's subterranean rivers and once a mad, bad center of London life.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An acoustic anomaly with a mysterious cause.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

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

A self-built castle made by a mysterious man.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

The trials and tribulations of marking Poe's grave.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Featuring a casually threatening atmosphere along with dessert and coffee to die for.

World-famous, Pink's still manages to keep its prized cult fetish status.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore 10 acres of environmental sculptures.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

A student driver's nightmare.