Beginning January 2, 2013, Jewel Cave National Monument will not offer advanced ticket reservations, except for Wild Caving dates. Due to construction projects and assumed disruptions in service, ticket sales will occur on a first come first serve basis. Contact Us By Mail Jewel Cave National Monument 11149 U.S. Highway 16 Building B12 Custer, SD 57730 By Phone 605-673-8300 Visitor Questions - Option 2 Hours of Operation - Option 3 School Programs / Field Trips - Option 4 By Fax 605-673-8397 - Visitor Center 605-673-8301 - Administrative Offices By Email e-mail us Wait! Before you send your message ... Jewel Cave National Monument receives hundreds of emails each year requesting information that is already available on our website. In an effort to save printed resources, postage, and staff time, we encourage you to browse the website for answers to your questions. As a Climate Friendly Park, we are trying our best to reduce, reuse, and recycle. Please join us in this Go Green effort.