This "common-as-dirt" museum celebrates the glory of normalcy.

A massive sustainable farm designed by the mastermind behind Central Park.

This unusual building straddles two countries.

One car at a time please.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

The world's largest collection of porcelain "veilleuses-theiere," or night light teapots, includes four that belonged to Napoleon.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

One man's homage to the orange as realized through a long-term folk art labor of love.

A museum has some wedding cake dating to the Teddy Roosevelt administration, and some bacon from FDR's.

The highest peak in Utah is the hardest to reach, but only if explorers choose the hard way.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

Visitors to this library are in for a real-world education in modernist architecture.

Largest man-made excavation on earth!

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Records of the dead describe the myriad odd ways people used to die.

A mysterious echo seems to defy the laws of acoustics.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

This picturesque stream was up until recently the site of a ten story mountain of slag and sewage.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.