Nottingham has about 500 sandstone caves, many closed to the public, Walker said. The caves date back to early Viking times in about 800 A. D.

沃克说：“诺丁汉市大约有500个砂岩洞穴，许多遗址已禁止游客观光。这些洞穴可以追溯到公元800年的维京时代。”

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Nottingham has about 500 sandstone caves, many closed to the public, Walker said. The caves date back to early Viking times in about 800 A. D.

沃克说：“诺丁汉市大约有500个砂岩洞穴，许多遗址已禁止游客观光。这些洞穴可以追溯到公元800年的维京时代。”

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