A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A beautiful South Korean gate and garden in Little Rock honors American Taekwondo.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This former coal gasification plant found a curious second life as a popular public park.

This working class sculpture pounds his hammer all the livelong day.

Famously misunderstood wonder of the ancient world

A beautiful Gilded Age hotel in the White Mountains with surprising diplomatic history.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

A mere dot on the map in the great north woods is the first place in America to vote in Presidential elections.

One of the last active volcanoes on the Eastern seaboard.

Fantastic views and thousands of love locks.

Tubing through a cave lit with glowworms is a magical underground experience.

One of the world's steepest streets seems to have houses sliding down it.

Highly spherical boulders on the shores of New Zealand.

The famous aviator's final resting place is a study in natural beauty.

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

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One woman's Viking Castle on Lake Tahoe.

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

Home to items never before seen by the public.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.