A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

A little sculpture with a large wardrobe.

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

The world's longest known cave system.

Bouncing, delightful, mechanical art at the MIT Museum.

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

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

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

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

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

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

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

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

These pretty kitties killed and ate as many as 135 railway workers.

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

Home to a protest movement, a bombing, and a dramatic change in labor history.

A monument to the art of slicing people open.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

An enormous park-like oasis, full of famous Chicagoans' graves.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An antiquated German apothecary on Chicago's North Side.