This colorful boulder serves as a canvas for political statements and artistic expression.

This historic roadhouse has many tales to tell of San Francisco's early history.

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.

A promotional sun clock on the site of San Francisco's great raceway.

The final resting place of the Emperor of the United States and Protector of Mexico.

The peaceful gravesite of a rugged wild west gunman echoes the touching story of his last days.

A bronze tribute to a legendary Californian, the self-proclaimed "Emperor of the United States."

A comprehensive collection of Pez dispensers.

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

A museum capturing one of the world's most famous classical composer's battle with hearing loss.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

Royals, rebels, and artists have all conversed at this grand 19th-century Viennese coffee house.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Baroque celebration of the end of the Great Plague of Vienna.

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

A small but charming botanical garden that contains many exotic plant species.

Elaborate tile work in this railway station tells the story of Portugal.

A seismograph and a bunker from the Cold War still sit under this university building.

Nicknamed "Karri Knight," this Eucalyptus was planted in 1895 and stands at 72 meters.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Portugal's National Pantheon has a history of curses, collapses and financial problems.