The Shell Grotto is a network of narrow underground passages and a chamber whose walls and ceiling are covered in intricate shell mosaics — roughly 4.6 million shells in total. It was reportedly discovered in 1835, but the age and purpose remain a mystery, which is half the fun. It’s officially Grade I listed and open to the public.

Vibes: crypt-meets-art-installation — small, dark, and very photogenic (no flash). Allow 15–30 minutes on site, plus time for the dinky museum & shop.

• Ornate shell mosaics Serpentine passage “Altar” chamber

• Shell count: ~4.6 million (mussels, whelks, cockles, limpets, scallops & more)
• Origins: debated — Victorian folly? ancient ritual site? secret society room? No one knows for sure.
• Listing: Grade I (national significance)

• Opening: usually daily in peak summer, then Wed–Sun most of the rest of the year — check live times before you go.
• Tickets: typically buy on arrival; they don’t generally do advance bookings.
• Duration: 15–30 mins in the passages; longer if you nerd out on the displays.

From Margate station

• Walk: ~15–20 minutes (1–1.1 miles) via town/Old Town.
• Bus: Local buses stop a few minutes away (e.g. Addington Street / Pump Lane). Loop and 8A commonly serve the area.
• Taxi: ~2–3 mins from the station if you’re tight on time.