Challenges in Maryland

Challenge Atlas · Maryland

1. Open-house weekend · Arts and culture Doors Open Baltimore See organizer for current participation window · Maryland, MD Doors Open Baltimore is a open-house weekend in Maryland, Maryland, with no upcoming dates listed.
2. Stamp passport · Lighthouses and maritime Maryland Lighthouse Challenge 2026 event cancelled; future status unknown · Chesapeake Bay, MD Maryland Lighthouse Challenge is a stamp passport in Chesapeake Bay, Maryland whose latest edition was cancelled.

Nationwide programs

1. Scavenger hunt · Geocaching and letterboxing Atlas Quest Letterboxing Year-round, individual boxes vary · Nationwide Atlas Quest Letterboxing is a scavenger hunt in nationwide, with no upcoming dates listed.
2. Geocache trail · Geocaching and letterboxing Geocaching Adventure Lab Year-round; individual adventures vary · Nationwide Geocaching Adventure Lab is a geocache trail in nationwide, with no upcoming dates listed.
3. Mileage goal · Hiking and summits North Country Trail Hike 100 Annual miles challenge, 2026 · Nationwide North Country Trail Hike 100 is a mileage goal in nationwide, with no upcoming dates listed.
4. Stamp passport · Parks Passport to Your National Parks Year-round, subject to site and visitor center hours · Nationwide Passport to Your National Parks is a stamp passport in nationwide, with no upcoming dates listed.
5. Stamp passport · Lighthouses and maritime Children’s Lighthouse Passport Pacific Northwest Ongoing USLHS kids passport for Oregon and Washington lights · Nationwide Children’s Lighthouse Passport Pacific Northwest is a stamp passport in nationwide, with no upcoming dates listed.
6. Stamp passport · History and America250 Mother Road Route 66 Passport 2025/2026 sixth edition multi-state stamp book · Nationwide Mother Road Route 66 Passport is a stamp passport in nationwide, with no upcoming dates listed.
7. Stamp passport · Lighthouses and maritime U.S. Lighthouse Society Passport Program Ongoing; many stamp sites seasonal. Michigan leads with roughly 112 stations. · Nationwide U.S. Lighthouse Society Passport Program is a stamp passport in nationwide, with no upcoming dates listed.