A former zoo turned public park, where visitors can hang out in the old animal cages.

Supposed Massachusetts Grave of a pre-Columbus Knight Templar.

An artifact taken from one of America's shortest wars.

The massive Roman arch in New Hampshire that was meant to be a tomb.

This cemetery is home to numerous granite headstones that are works of art unto themselves.

The only surviving building of historic West Boylston, which was flooded to create the Wachusett Reservoir.

A spooky and decrepit mental health facility is slowly being replaced with newer digs.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

This giant Boston statue of Mary is standing on a globe to show her power over the universe.

This clock tower is all that remains of Bird Hall, constructed by one of the founding families of this Massachusetts town.

This castle constructed in 1928 was crafted from drawings of Lismore Castle in Ireland.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

This unassuming stone commemorates a condiment factory gone up in smoke.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

This tower commemorates the spot where George Washington hoisted the Grand Union flag.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

Murder scene memorialized in perpetuity by grisly obelisk.

This memorial garden is the final resting place of many beloved pets including that of a famous explorer.

This art display in Dedham honors a local fish, and is dedicated to the volunteers who restored the canal.

This building is more than 250 years old and was built in one of the first towns settled in Massachusetts.

All that remains of the Whittall mansion are the ruins of the formal garden and its pergola, dedicated to the late Matthew J. Whittall by his widow.