A massive volcanic plug is now a protected area that hosts a number of bird species.

The unbelievably opulent home built for an infamous newspaperman.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

This golf ball–shaped former desert real estate office now houses a UFO museum.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

An obscure waterfall that looks like something out of a fantasy novel.

The world's longest known cave system.