A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Thousands of people walk over this fantastic work of art every day, but how many notice it?

One of Frank Lloyd Wright's final works was this UFO church.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

Almost half-way between the Equator and North Pole.

Try your hand at old-fashioned coffee growing at this museum devoted to one of the world's most coveted beans.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A controversial memorial at the place where Captain Cook met his violent end.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Apparently, the whole cosmos emanates from this plain concrete tower.

Every president in history is immortalized in bronze in downtown Rapid City.

A fitting attraction for the corn capital of the world.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

Large one-man sculpture park in Michigan.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.