The last remnant of a tree that helped prove to the world that sequoias are real—and they’re spectacular.

These markers are used to document elevation changes around the famed dam.

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

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

A tunnel with windows, so you don't miss out on the impressive views.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

A particularly disconcerting tribute to Irish martyrs.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

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

This rock formation named for its unique shape is one of many that call the Alabama Hills home.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Commonly referred to as the most photographed Victorian home in the United States.

The second-largest giant sequoia in the world.

This redwood is a historic landmark, a town’s namesake, and the dancing sideline symbol of Stanford University.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

Everything you always wanted to know about borates is here.