Building 21

Building 21: crowds and conditions

Typical pattern: moderate; weekends busier. Been there recently? Post today’s status and it shows here for the next traveller.

Status options for this fort: Open, good conditions · Very crowded · Approach road bad · Closed / not accessible.

Best time to visit Building 21

Season: October to February; carry water in summer.

Busiest days: Weekends and long holidays.

Crowd: Moderate; weekends busier.

Typical week: Mon light · Tue light · Wed light · Thu light · Fri light · Sat busy · Sun busy.

How to reach Building 21 — distance from nearby cities

Coordinates: 24.55700, -81.80693. Road distances are estimates; the road-trip planner uses real routes and adds stops worth the detour.

Places to visit near Building 21

• Mel Fisher Maritime Museum · museum · Monroe · ~0 km · Must-see
• Key West Aquarium · sanctuary · Monroe · ~0 km · Must-see
• Shipwreck Treasures · museum · Monroe · ~0 km · Must-see
• The Ernest Hemmingway Home and Museum · museum · Monroe · ~1 km · Must-see
• Key West Lighthouse · beach · Monroe · ~1 km · Must-see
• Fort Zachary Taylor Historic State Park · fort · Monroe · ~1 km · Must-see
• Key West Butterfly & Nature Conservatory · sanctuary · Monroe · ~2 km · Must-see
• Southernmost Point Buoy · fort · Monroe · ~2 km · Must-see
• Key West · river spot · Monroe · ~4 km · Must-see
• Smathers Beach · beach · Monroe · ~5 km · Must-see
• Fort East Martello Museum · museum · Monroe · ~7 km · Must-see
• Boca Chica Key · river spot · Monroe · ~16 km · Must-see
• Sand Key Light · fort · Monroe · ~17 km · Must-see
• Geiger Key · river spot · Monroe · ~19 km · Must-see
• Florida Department of Environmental Protection · sanctuary · Monroe · ~20 km · Must-see
• Sugarloaf Key Bat Tower · river spot · Monroe · ~32 km · Must-see
• American Shoal Light · beach · Monroe · ~37 km · Must-see
• Great White Heron National Wildlife Refuge · sanctuary · Monroe · ~47 km · Must-see

See everything within a day’s drive of Building 21

Other forts & heritage near Building 21

• Fort Zachary Taylor Historic State Park · fort · Monroe · ~1 km · Must-see
• Southernmost Point Buoy · fort · Monroe · ~2 km · Must-see
• Sand Key Light · fort · Monroe · ~17 km · Must-see
• Key West Naval Station · fort · Monroe · ~0 km
• The Shops at Mallory Square · fort · Monroe · ~0 km
• Weather Station Inn · fort · Monroe · ~0 km
• Key West - Florida Keys Historical Miltary Monument · fort · Monroe · ~0 km
• Historic District · fort · Monroe · ~1 km
• Battery Seminole · fort · Monroe · ~1 km
• Fort Zachary Taylor · fort · Monroe · ~1 km

All forts & heritage in Florida

Frequently asked