This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

The platform atop this verdant volcano was built with the help of a royal elephant.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

There aren't too many operational funiculars around, but Pittsburgh has two!

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A lush green oasis in the middle of Chicago.

These chunky stone towers out in Lake Michigan are the key to Chicago’s drinking water.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

First planned industrial community in the United States.

Moonbows over Kentucky.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

The only building in Louisville (hopefully) that contains two ancient holy skeletons.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

Nature's biggest mammal swims in landlocked Oklahoma.

A failed piece of Orientalism has become the proud symbol of a community.

Decades before the scandal, this staircase on the river was a literal "water gate."

Georgia's first brewery is also one of its oldest surviving buildings.

If all members were present at the table, a sixth of the world's wealth would be under the same roof.

For 32 years the famous Ringling Bros circus troupe spent winters in this sunny spot in Florida.

On Hilton Head Island this bronze King of the Sea rules all things briny—and lets you know if you’re late for lunch.

This bare tree might not have leaves but it is constantly clothed in festive decorations left by mysterious local benefactors.

A mailbox that saved a nature reserve.