By Erika Owen
July 28, 2015
Credit: John Fowler

The Subway in Zion National Park in Utah may be the only 'subway' that invites visitors to explore its nooks and crannies—probably because it isn't used for travel at all. The space is a natural phenomenon, formed by water rushing through the slot canyon creating a very smooth, circular opening. The real intrigue comes when you bring a camera into the space. The rushing water left behind small puddles that give off different colors depending on the light breaking through into the cavern.

Credit: John Fowler

According to the Zion National Park website, there will be road closures affecting entry into The Subway through October, so plan ahead. It's also recommended that you visit the space with a hiker well-versed in the area—getting into the ethereal space requires what's been described as a strenuous 9-mile trek.

Erika Owen is the Audience Engagement Editor at Travel + Leisure. Follow her on Twitter and Instagram at @erikaraeowen.