This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The world's most active stratovolcano is almost always erupting.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

These gigantic skeletons tower over visitors and provide insight into the creatures that once ruled over Ireland.

Though they've since been renamed, these two streets hint at Dublin's darker days.

Auburn's iconic eagle flight goes back to a 19th century eagle that dropped dead on the field after inspiring the football team to victory.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

The house where the writer spent his formative years.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

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

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

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

An homage to Jackie Gleason's bus-driving character from 'The Honeymooners.'

An aptly-named street near the birthplace of the modern LGBT rights movement.

A set of seven houses, each built in a style that represents a European country.

This plaque marks the former home of one of the first women physicians in the Netherlands.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

Lumps of significant stone from around the world surround a flaming monument for peace.