There can be only one three... so here are the other photos I considered but ultimately rejected for this contest.
Click on any photo to view larger size.
A pair of legs on Delicate Arch
A pair of gondolas over a sea of autumn color in Stowe, VT
A pair of railroad tracks in the historic town of Thurmond, WV
A pair of observatories on Mauna Kea
A pair of waterfalls on Kauai