Pennsylvania's own Roswell-style UFO mystery.

Steepest flood safety railway in the entire world.

The largest earthwork effigy in the world.

Advice-columnist's bell tower, paid for with pennies.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

The bones of an old zoo crumbling in the shadow of a new one.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

This sprawling bookstore spans four floors and has more than a million books in stock.

Once the tallest building in Detroit, this Gothic church houses some of the oldest stained-glass windows in the country.

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

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

A beach made of semi-precious green sand on the Big Island of Hawaiʻi.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This legendary urban waterfall creates a dazzling display of rainbows.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

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

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

Featuring the largest CinemaScope screen in Pennsylvania, this drive-in has entertained moviegoers for more than half a century.

This beloved marketplace mascot poops money and grants good luck.

Yo, Adrian!

Where America’s first doomsday cult awaited the end of the world.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

A tiny, unmarked beer and whiskey bar above an Ethiopian restaurant in West Philly fails to conceal live bluegrass.