A swing to dangle you off the very edge.

A turquoise lake within a volcanic crater.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The land is home to swimming ponies and a legendary 18th-century treasure.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

A priceless collection of the Nation's cryptologic history.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

An original apothecary from 1792.

A former major munitions plant that has been converted into a sprawling art space.

The United States Capitol's former columns still stand.

A historic arena where the Beatles played their first concert in the U.S.

The house where John Wilkes Booth conspired with his co-conspirators.

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

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

An emerald-green grotto just a short trip from Austin.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

On Japan's Tashirojima Island, cats are king.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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