A castle built for love, and abandoned due to heartbreak.

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

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Elevated freight railway turned wildly successful urban park.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

On the Hudson resides one of the largest clocks in the world.

A serene plaza that commemorates one of the Granite State's most iconic figures.

A very big rock just plopped down in the New England woods.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This erect, phallic geological spire wasn't always named so domestically.

An experimental, automotive replica of Stonehenge.

The only arched bridge made of stone on the entire Mississippi River.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

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

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

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

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This tiny Hawaiian island is slowly coming back to life after being bombed during naval training exercises.