The oldest Royal Park, with the Prime Meridian line and the Royal Observatory at the summit. Stand on the line that divides east and west, then walk down through the park to the Thames at Greenwich. The view from the hilltop across the Old Royal Naval College and Canary Wharf is one of London's best.
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Start at the Royal Observatory for the Prime Meridian and the museum of timekeeping (paid entry). The view from the observatory hill is free and the main reason to visit. Walk down through the park to the river — the Old Royal Naval College and Cutty Sark are at the base. Allow a full morning or afternoon for Greenwich as a destination.
Weekday mornings for fewer crowds at the Meridian line photo spot. Summer weekends are packed but lively. The park is large enough that you can always find space. Combine with Greenwich Market and the riverside for a full day out.
The Prime Meridian was established here in 1851 — Greenwich Mean Time originates from this spot. The Royal Observatory houses John Harrison's marine chronometers (the longitude problem solution). The view from the hill is free; the museum costs extra. The park is 183 acres and includes deer. DLR from central London takes 20-30 minutes. One of the essential London excursions if you have time for a half-day trip.