Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

An ancient Egyptian temple in the middle of Madrid, Spain.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

Single runway interrupted by a busy road that cuts across its middle.

Activists are fighting to preserve these unfinished highway ramps as a tribute to the citizen revolt that halted their construction decades ago.

The celebrated eyesore created by starry-eyed sweethearts.

They sort through millions of dollars worth of diplomatic gifts on behalf of the government.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The most accurate timepiece in the world.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

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

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A colorful statue honoring the local salmon in glass and bronze.