Kastellet

This beautifully preserved 17th-century star-shaped fortress offers wide open spaces perfect for kids to run, explore, and burn off energy. The unique fortification design with ramparts, moats, and historic buildings creates an exciting outdoor adventure that feels like stepping into a history book, while the spacious grounds are ideal for picnics and leisurely family strolls. Plus, it's just a short walk from the iconic Little Mermaid statue, making it easy to combine two Copenhagen highlights in one outing.

• ✓Walking or biking along the star-shaped ramparts with views of the moat
• ✓Spotting the historic windmill and colorful military buildings
• ✓Feeding ducks and swans in the surrounding moat (bring appropriate bird food)
• ✓Easy 5-minute walk to see the famous Little Mermaid statue
• ✓Wide open green spaces perfect for running, games, and picnics

1. 1.Arrive early morning (around 6:30-7:00 AM) for peaceful walks before tour groups arrive at the nearby Little Mermaid statue
2. 2.Bring bikes or scooters as the flat, paved paths are perfect for young riders and the fortress is larger than it appears
3. 3.Pack a picnic to enjoy on the grassy ramparts with scenic views, as there are limited food options within the fortress itself
4. 4.Visit the windmill and historic buildings for free exploration, and let kids climb the earthen ramparts for a fun physical challenge
5. 5.Combine your visit with the Little Mermaid statue (5-minute walk) and Churchill Park to make a full morning adventure

Weekday mornings between 8:00-10:00 AM offer the most peaceful experience before cruise ship tours arrive. Late spring through early fall (May to September) provides the best weather for outdoor exploration, though the fortress is beautiful year-round.

Entry is completely free and the grounds are mostly flat and stroller-accessible, though some ramparts have stairs. There are no cafes inside the fortress, so bring snacks and water, and note that it's still an active military site so some areas are restricted.

Open year-round with the same hours. Summer (June to August) offers the warmest weather and longest daylight, perfect for extended visits. Winter visits can be chilly but provide a peaceful, crowd-free experience with potential for beautiful snow-covered ramparts.

Cafe Petersburg, located just outside the fortress near the Little Mermaid, offers casual family-friendly dining with sandwiches and Danish pastries. Alternatively, head to nearby Nyhavn district (15-minute walk) where colorful waterfront restaurants offer kid-friendly menus and high chairs.