An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

The first hospital in the New World.

The final resting place of Christopher Columbus - or possibly someone else.

Largest pre-Lent festival in the Dominican Republic.

This replica medieval European village in the Dominican Republic was built by a Hollywood set designer.

Secret refuge and museum of the Duke of Florence.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

An old department store turned Nazi prison turned artist commune.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Lie in a hammock where George Washington stood.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

Avoid gangster interaction while window-shopping.

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

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A celebration of capitalism in Midtown.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Elevated freight railway turned wildly successful urban park.