DENVER — Lizard people, apocalyptic art, Freemasons and a New World Order.

Conspiracy theories about Denver International Airport began before the airport was complted.

There were questions about why construction went nearly $2 billion over budget, whether there was a secret purposed for the baggage tunnels and why the property was so large — 35,000 acres.

“More acreage than an airport that size could possibly need,” one website pointed out.

That sparked theories about a huge subterranean military bunker, or possibly a massive fallout shelter for the elite or maybe even a “concentration camp” for future government use.

Now the airport is picking one lucky winner to explore the airport’s infamous, underground tunnel system.

All you have to do to enter is comment on one of the airport’s designated Facebook posts.

The deadline is 5 p.m. Wednesday. The winner will be notified by Thursday.

Tomorrow, we will pick a random winner of a tour of the airport tunnels for #DENconspiracy month. Enter on Facebook https://t.co/NJGbDCATZD pic.twitter.com/kyIJiqdQdb

— Denver Int'l Airport (@DENAirport) October 18, 2016

The official prize includes a tour for two individuals of the baggage tunnels, as well as a lunch at a restaurant of the winner’s choice (not to exceed $120 in value).