The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The only land territory disputed between the U.S. and Canada.

The world's largest piece of copyrighted artwork.

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

This impressive Boston holy house is the American mecca for Christian scientists.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

The site of Paul Revere's historic two lantern warning.

Ice cream stand, snack bar, and time capsule of milk conveyance.

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.