Museum, Portland Museum and Wareham Town Museum. Dorset contains 190 conservation areas, more than 1,500 scheduled monuments, over 30 registered parks and gardens and 12,850 listed buildings. Grade I listed buildings include: Portland Castle, a coastal fort commissioned by Henry VIII; a castle with more than a 1,000 years of history at Corfe; a Roman ruin described by Historic England as the "only Roman town house visible in Britain"; Athelhampton, a Tudor manor house; Forde Abbey, a stately home and former Cistercian monastery; Christchurch Priory, the longest church in England; and St Edwold's church, one of the smallest. Dorset hosts a number of annual festivals, fairs and events including the Great Dorset Steam Fair near Blandford, one of the largest events of its kind in Europe, and the Bournemouth Air Festival, a free air show that attracted 1.3 million visitors in 2009. The Spirit of the Seas is a maritime festival held in Weymouth and Portland. Launched in 2008, the festival features sporting activities, cultural events and local entertainers. The Dorset County Show, which was first held in 1841, is a celebration of Dorset's agriculture. The two-day event exhibits local produce and livestock and attracts some 55,000 people. Inside Out Dorset is an outdoor arts festival that takes place every two years in rural and urban locations across Dorset. In addition to the smaller folk festivals held in towns such as Christchurch and Wimborne, Dorset holds several larger musical events such as Camp Bestival, End of the Road and the Larmer Tree Festival. Dorset's only professional football club is AFC Bournemouth, which plays in the Premier League—the highest division in the English football league system. Non-League semi-professional teams in the county include Southern Premier Division teams Dorchester Town F.C., Poole Town F.C. and Weymouth F.C. Dorset County Cricket Club competes in the Minor Counties Cricket Championship and is based at Dean Park Cricket Ground in Bournemouth. Poole Stadium hosts regular greyhound racing and is the home to top-flight speedway team Poole Pirates. The county's coastline, on the English Channel, is noted for its watersports (particularly sailing, gig racing, windsurfing, power boating and kayaking) which take advantage of the sheltered waters in the bays of Weymouth and Poole, and the harbours of Poole and Portland. Dorset hosted the sailing events at the 2012 Summer Olympics and 2012 Summer Paralympics at the Weymouth and Portland National Sailing Academy. The venue was completed