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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

One of the now-less-hidden floral gems of the "Emerald Necklace."

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.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The famous aviator's final resting place is a study in natural beauty.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

There's an exclusive Beefeaters pub hidden in the Tower of London.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Centuries later, the victims of Great Britain's greatest hysteria are finally being remembered.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

A measuring mishap led to these artificial stone ladies losing their stomachs.

A 14th century castle built on the seat of a mighty giant.

This castle has links to Portugal’s founding and struggles for independence.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

Few of the many visitors to this resort town know of its hidden Maya ruins.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.