If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Every equinox this Maya pyramid puts on a spooky ancient light show.

A decommissioned military complex that's now a modern industrial park.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

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.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

Why have you never heard of the second most popular tourist site in New York?

The only arched bridge made of stone on the entire Mississippi River.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

An extensive collection of ancient Egyptian artifacts and mummies.

This massive redwood tree has a hole in the base big enough to drive through.

An optical illusion found amid a logged redwood forest.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A Roman-style column in Oregon hides a spiral staircase inside.

100-year-old shipwreck you can walk up to at low tide.

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

Statue dedicated to the star of an old television show.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

Three columns of volcanic rock shoot out of the ocean.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

One of the few surviving "Wigwam"-themed motels.