A unique collection of more than 250 rocks and minerals located on a university campus.

A castle on a hill once named "the most beautiful high school in Massachusetts."

The Boston home of a conductor on the Underground Railroad.

Historic seaside park featuring explorable, abandoned military structures.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

These beautiful garden buildings are among the oldest surviving greenhouses in the United States.

One man built this massive wall to keep his neighbor from complaining about working on Sundays.

This location holds the truth to what truly happened that faithful night.

A plaque marking the famous abolitionist's birthplace often overlooked by visitors to the nearby Charles Sumner House.

A historic bridge no one is allowed to cross.

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

The Atlantis of Cape Cod reemerges during the lowest of tides.

One of America's most historic homes also holds a startling literary legacy.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

Museum dedicated to awful artwork.

Right angles in the forests of Panama.

This softball diamond has a culture all its own.

This church was transported brick by brick from the ruins of a 16th-century city into Panama City's current historic district.

A pocket of jungle amidst urban expansion in Panama.

A no-frills, DIY nature preserve manned by a U.S. expat who has dedicated his life to turtle conservation.

The rusting hulk of a hand-powered, nearly 160-year-old submarine abandoned in 1869 due to the ravages of decompression sickness.

A mysterious dark-skinned Christ statue has been this town's religious center for centuries.

A huge, bustling local market in Panama City.

A "Minnesota-style" pizza parlor in the Scandinavian heart of Seattle.