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

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

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

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The massive machine creates cracking displays of indoor lightning.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

19th-century operating theatre in which the use of ether was first demonstrated - plus, a skeleton and a mummy!

Visit the last surviving outlet of a once popular chain of coffeeshops.

A memorial to the British politician who spearheaded the National Health Service.

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

This Welsh hotel is the spiritual home of the British 1953 Everest expedition, the first successful ascent of Mount Everest.

The artist David Nash planted a circle of trees in 1977.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

A beautiful medieval bridge allegedly constructed by the Devil.

This collection of 20th-century toys is filled with a lifelong personal toy collection brought from the U.S. to Amsterdam.

A line number in Amsterdam that will likely never be used again due to its tragic history.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This unusual elevator doesn’t stop or slow down.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This unattributed sculpture in Amsterdam is hiding in plain sight.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.