This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

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

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

The final resting place of a space program monolith, soon to be unveiled again to the public.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

A hot dog stand where the heads are just as hot as the dogs.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

10,000 flowered plants bloom in the City of Roses.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

This sandstone mansion was the home of two of Oregon's most important pioneers.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.