Geography

Hudson Bay, New York, Denver, the Bering Strait, the Sunshine State, Hawaii, Vienna, California, Seattle, Puget Sound, Maine, Nebraska, Alaska, L.A., Miami Beach, West Palm Beach, the Midwest, Fort Lauderdale, Tokyo, San Francisco, Paris, New Jersey, Tampa Bay, Juneau, Thailand, Prince Edward Island.

These are the specific places Adam Young mentions in his songs, but on top of that you'll find his many references to celestial bodies like the moon, sun, stars, and the galaxies that contain them. If you still want more variety, you can look at all the places without names that he visits in his works: caves, oceans, fields, mountains, forests, rivers, and more.

It's not the only thing he talks about, but it is revealing of some of his major themes. He loves nature, obviously; the beauty and wildness of it, as well as the sense of wonder it instills in us. Juxtaposed with that, though, is a strong current of modern and future technology, of travel through the stars and architectural  design placed amidst the treasures of nature.

Adam started producing his music as a remedy for his insomnia. What things occupied his mind? Apparently, the wonder of the natural world created by God (who he talks about in a number of songs), mixed with the marvel of human ingenuity and our place in the universe. Then, of course, he also talks plenty about love, loneliness, and the varied topics that comes to one's mind in the stillness of the night when you really should be sleeping but can't help staying up instead to wonder and think.