Enköping is a small city west of Uppsala, close enough to Stockholm and Västerås to be easy by train, but with a quieter Uppland character of parks, lake-country estates, and old trade routes. It calls itself Sweden's nearest city, which is marketing, but the geography helps: roads, rail, and Lake Mälaren all meet here.
The city is best when treated as a gentle day out rather than a blockbuster. Start with the parks and local museum in the centre, then use a car or summer boat to reach the countryside. The strong anchors are outside the main streets: Boglösa's rock carvings, Grönsö Manor, and Ekolsund Castle give Enköping a much older and grander story than its modern size suggests.
This is not a place to rush through a checklist. Come if you like Swedish small towns, gardens, Bronze Age remains, and manor-house landscapes around Lake Mälaren. If you are already in Uppsala, Västerås, or Stockholm and want a lower-key excursion, Enköping clears that bar.