This massive, neoclassical cathedral on Szent István tér on Castle Hill, is the largest church in Hungary. In good weather, it is a 3.5km (2 mile) walk, otherwise bus nos. 1 or 6. The cathedral is Esztergom's most popular attraction and one of Hungary's most impressive buildings. Built in the last century, it was to replace the original cathedral ruined during the Turkish occupation. The blue and red marble coloring in the church and chapel is striking, and it claims the world's largest altarpiece painted on one continuous piece of canvas. The crypt, built in old Egyptian style with a magnificent statue of an angel, is also the last resting place of bishops. The cathedral treasury (kincstár) contains a dazzling array of ecclesiastical jewels and gold works. If you brave the ascent of the cupola, you're rewarded with unparalleled views of Esztergom and the surrounding Hungarian and Slovakian countryside. There is a warning for the cupola that if you're agoraphobic, you should not risk it. Actually, it should be if you're claustrophobic, as the staircase and walking areas are extremely narrow. If you happen to be in town during the first week of August, don't miss out on one of the classical guitar concerts performed in the cathedral; the acoustics are said to be sublime. The concerts are part of Esztergom's annual International Guitar Festival.