
Which is a TRAVEL book
within the actual book.
The Big Bang Theory Season 8, Episode 8

Read, rest, TRAVEL.
The Big Bang Theory Season 5, Episode 16

But it does involve air TRAVEL.
The Big Bang Theory Season 3, Episode 15

Because we're going to TRAVEL to the past.
Money Heist Season 3, Episode 4

That if we TRAVEL west,
that we will somehow reach a land
Vikings Season 1, Episode 1