Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

An architectural oddity hides in plain sight on this iconic London bridge.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Frida Kahlo's childhood home, now a museum of her life and works.

The only castle in North America to ever house European sovereigns.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This museum houses two of Mexico's most impressive Aztec monoliths.

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

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The Habsburgs' royal collections of art and wonders.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Designed as a reminder of one of the darkest moments in Austrian history.

The supreme shrine of the state.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Oldest building in California still in use.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

An inconspicuous footbridge beloved by San Diego locals.