The modern birthplace of Irish freedom.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

The air force base preserves its scars from the Japanese attack on Pearl Harbor.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

100-year-old shipwreck you can walk up to at low tide.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

Electrical pylon in the shape of Disney's beloved mouse.

A bizarre house filled with an astounding array of collections.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

Recovered from the brink of extinction, at home in the Financial District.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

Every equinox this Maya pyramid puts on a spooky ancient light show.