Sitting atop San Francisco's tallest hill, a cross honors the victims of the Armenian genocide.

Sip coffee and talk politics at this landmark cafe in Astoria's Little Egypt, a contender for the title of America's first hookah bar.

An eerie, abandoned military base engulfed by nature and graffiti is now home to a local park.

An eerie diorama that captures the majestic nature of a few prehistoric-looking beasts.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

This tall and trim architectural oddity is one of the skinniest buildings in San Francisco.

A red brick monolith is all that remains of New England’s first commercial brickyard.

The ruins of Vancouver's abandoned heritage railway.

These little-known sands dunes are a geological anomaly in Saskatchewan's southern prairies.

An early-19th-century hotel with a past that is steeped in the Civil War.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

A quiet nook at the top of a little-known hilltop park named after California's first poet laureate.

The buildings are among the few Frank Lloyd Wright structures still standing in Japan.

The first neighborhood to implement the Garden City model in its suburban planning.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

This painted marvel is San Francisco's 400-foot ode to urban biking.

This contorting sculpture is the tallest in San Francisco.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

An allegedly haunted mansion with a tragic, tawdry past.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

These subterranean models show Mexico City's central square during three different eras.

These century-old townhouses contain some of the first car garages built in the United States.