All this talk about Denver and tunnels perked my interest to go looking.

What are tunnels? Conduits thru which things pass.

40,000 ft. view using Google Earth.

Missing [I] in many Q drops.

I-70 has a part missing, when viewed from above, at the Eisenhower Tunnel.

What did I find [near] there?

Keystone Resort

Lots of symbolism there, including Area 51.

Check out the trail names.

https://www.keystoneresort.com/

https://assets.vailresorts.com/-/media/keystone/files/key1819trailmap.ashx

Includes a notice to ski [SMART]. re: POTUS use of SMART in some tweets.