This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Hear the quietest sound from across the dome.

The modern birthplace of Irish freedom.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

Museum dedicated to awful artwork.

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

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

Three prestigious academic collections come together to create a world-class natural history museum.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The Hudson River School comes alive at this palatial estate.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

"A hideous albatross in the Hudson River Valley."