This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A world-class collection of mechanical musical instruments and automata.

A unique sculpture park that specializes in the huge and bizarre.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The massive machine creates cracking displays of indoor lightning.

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

An enormous, inside-out glass globe built in 1935.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Home to items never before seen by the public.

The United States Capitol's former columns still stand.

Elevated freight railway turned wildly successful urban park.