One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

An early 20th-century bullring converted into a modern shopping center.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

A dangling church built over a Colombian gorge.

A celebration of Colombia’s premier contemporary artist.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

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

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

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

This private residence was the template for one of the most beloved television homes of all time.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

The blinking light atop the iconic landmark has been sending secret messages for decades.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

The first piece of public art dedicated to LGBT rights.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.