This landmark cemetery in Boston was created more than 300 years ago.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

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

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

A man-made island in scenic San Francisco Bay.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

One of the world's few mounted blue whales, its jaws are hinged open allowing visitors to descend into a lounge.

This chimerical bridge/tunnel appears to dead end right into the sea.

Sweden's "good old days" painstakingly re-created in a model village.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This 19th-century fountain's namesake animal isn't what you think it is.

Giant topiary dog once played a role in a terrorist bomb plot.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.