The National Library of Sweden is home to the largest medieval manuscript still in existence: an enormous, three-foot-tall Bible with an unusual portrait of the devil inside (along with a calendar, some spells, and a lengthy confession of the writer’s sins and temptations). Legend has it that it was created by a monk under duress over the course of one evening… with some supernatural help.

Check out more about the Codex Gigas online.

Fifteen years ago, drones were considered toys. Today, there’s everywhere – both in the news and physically. But before the big splashy news stories like the recent New Jersey drone panic, a much quieter – and stranger – incident took place at a highly secure Air Force base.

Read more of Gordon Lubold’s reporting.

Dylan and producers Johanna and Amanda take your questions.

For our next mailbag, we’re looking for questions about solo travel. If you have a question for Dylan about traveling by yourself, give us a call at 315-992-7902 and leave a message. You can also record a voice memo and email it to us at Hello@AtlasObscura.com, or simply email your question.

We want to hear about your favorite unusual local date spots. One rule: No romantic restaurants! Where are the places that you bust out when you’re really trying to impress someone with an obscure, off the beaten track spot? And, we want to hear your questions about travel and dating, cause we'll have an expert on the show soon to dish out answers. Give us a call at 315-992-7902 and leave a message telling us your name and story. Our mailbox will cut you off after 3 minutes so please call back if you get disconnected. Or record and send a voice memo to Hello@AtlasObscura.Com.

A midwest city has embraced what it means to be the namesake hometown of one very famous superhero. And at its center is a museum that holds the carefully cultivated collection of one superfan.

READ MORE IN THE ATLAS https://www.atlasobscura.com/places/super-museum-metropolis

In the 1960s, the band the Grateful Dead became consumed by a quest that would take up 10 years, cost millions of dollars, and almost break up the band. It was the quest for audio perfection – to bring crystal clear sound from the front row to the nosebleeds and back again. It’s a story that takes us from the infamous acid tests of the 1960s to standing in front of a 60-foot tall wall of 600 speakers…and to tell it we’re joined by Brian Anderson, author of “Loud and Clear: The Grateful Dead’s Wall of Sound and the Quest for Audio Perfection.”

The staff here at Atlas Obscura answered an unsettling question for this episode: Where would you spend the last day before the apocalypse? Some interesting truths come out.

Plus, we want to hear from you. Tell us where YOU would spend your last day before the hypothetical apocalypse. What connection do you have with this place? Why would you spend it there? What would you do if you had the whole place to yourself? Give us a call at 315-992-7902 and leave a message telling us your name and story. Or record a voice memo and email it to us at hello@atlasobscura.com

An ancient book contains a controversial Greek recipe, one of the earliest examples of patent law, and answers for a perennial problem: how to make conversation at a dinner party.

Learn more about Deipnosophistae.