The Atlantis of Cape Cod reemerges during the lowest of tides.

The largest glacial erratic boulder on Cape Cod.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

One of the only known surviving coconut palm trees in the entire state.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

Oldest building in California still in use.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

This historic store hides a museum exhibiting a shoe-sizing x-ray machine and a pair of kicks that once belonged to the world's tallest man.