This jail which was in service for over a century is now open for curious visitors.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

The oldest surviving presidential residence in the United States.

This sculpture of a fisherman spent six years at the bottom of the Schuylkill River.

This tiny cottage surrounded by railroads is the oldest surviving structure in Fairmount Park.

One of Philadelphia's largest murals resides hidden under this bridge.

America's smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

This historic pub has maintained much of its 1906 decor, including a small sequestered room for women, where orders were slipped through a tiny window.

This Old West prison built into the side of a cliff was said to be inescapable.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

This 17th-century pub once had a hole in its wall so the neighboring blacksmith could easily access beer.

An exact replica of Bill Clinton's childhood home stands within a resort in Japan.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

Located just behind a quiet residential neighborhood, this is ground zero for the Salem witchcraft hysteria of 1692.

Hidden beneath the waters of Lake Michigan rests a perfectly intact ship from the early 1900s.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Modern sundial uses ancient methods to tell time and date perfectly.

This 14th century tower house was once the home of Irish poet W.B. Yeats.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

A remarkably intact castle that once was the largest in Ireland.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.