The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

A huge musical instrument played by the ocean.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

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

These ancient sacred grounds granted amnesty to those who managed to reach them.

This black shoreline is made up of exploded lava particles.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

This abandoned boat was left in place thanks to its rotting beauty.

A burnt orange monolithic dome structure perched on a hillside near Interstate 280.

A contemporary fresco movement illustrates the region's rich history.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Ancient paintings known as the "Sistine Chapel of Cave Art."

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.