25 photos show hidden gems across the US

Fly Geyser.

: Bernard Friel/Education Images/Universal Images Group via Getty Images

• From ice caves on the Apostle Islands to Arizona's red rocks, the US is full of hidden travel gems.
• You might not know about these 25 incredible locations in the US.
• Stand-out spots include the Fly Geyser in Nevada and the Blue Lakes Trail in Colorado.

Amid prolonged airport chaos and rising oil prices, you may be unsure if you should book your summer travel yet.

But...