TheTempleofHeavenTheTempleofHeavenisaworthwhilevisitingplaceinBeijing.ItismuchbiggerthantheImperialPalace(theForbiddenCity)andsmallerthantheSummerPalacewithanareaofabout2700000squaremeters.Thetemplewasbuiltin1420A.D.intheMingDynastytooffersacrificetoHeaven.AsChineseemperorscalledthemselves“theSonofHeaven”,theydarednottobuildtheirowndwelling“ForbiddenCity”biggerthanthedwellingforHeaven.TheTempleofHeavenisenclosedwithalongwall.Thenorthernpartwithinthewallissemicircularsymbolizingtheheavensandthesouthernpartissquaresymbolizingtheearth.Thenorthernpartishigherthanthesouthernpart.ThisdesignshowsthattheheavenishighandtheearthislowandreflectsanancientChinesethoughtof“Theheavenisroundandtheearthissquare”.TheTempleofHeavenisdividedbytwoenclosedwallsintoinnerpartandouterpart.Themainbuildingsofthetemplelieatthesouthandnorthendsofthemiddleaxislineoftheinnerpart.ThemostmagnificentbuildingsfromsouthtonortharetheCircularTerrace,theImperialHeavenlyVaultandtheHallofPrayerforGoodHarvests.Also,therearesomeadditionalbuildingslikeThreeEchoStonesandEchoWall.CircularTerracehasthreelayeredterraceswithwhitemarble.DuringtheMingandQingDynasties(1368A.D.~1911A.D.),theemperorswouldoffersacrificestoHeavenonthedayoftheWinterSolsticeeveryyear.ThisceremonywastothankHeavenandhopeeverythingwouldbegoodinthefuture.HallofPrayerforGoodHarvestsisabigpalacewithroundroofandthreelayersofeaves,theroofiscoveredwithblack,yellowandgreencoloredglazerepresentingtheheavens,theearthandeverythingonearth.AnotherimportantbuildingintheTempleofHeavenisImperialHeavenlyVault.Ifyoulookatitfromfaraway,youwillfindthatthevaultislikeablueumbrella.ThestructureofitislikethatofHallofPrayerforGoodHarvests,butsmallerinsize.Thevaultwasmadeofbricksandtimber,withwhitemarblerailingssurrounded.ThreeEchoStonesisoutsideofthegateofImperialHeavenlyVault.Ifyouspeakfacingthevaultwhilestandingonthefirststone,youwillhearoneecho;standingonthesecondandthethirdstone,youwillheartwoandthreeechoesrespectively.AnotherinterestingandfamousplaceforyoutovisitiscalledEchoWallowningspecialfeature.ThewallenclosesImperialHeavenlyVault.Itsperimeteris193meters.Ifyouandyourfriendstandattheeastandthewestrootsofthewallrespectivelyandyouwhisperaword,thenyourfriendwillhearclearlywhatyousay.Isn’titinteresting?Thephenomenonutilizesthetheoryofsoundwave.天坛在北京,天坛是一个值得参观的地方。它的面积约为270万平方米,比故宫(紫禁城)大得多,比颐和园小。天坛始建于明代公元1420年,为祭天之用。由于中国皇帝自称“天之子”,所以他们不敢使自己的住宅“紫禁城”比天的大。天坛被长长的围墙围着。墙里的北面部分是象征着上天的半圆环,南部是象征着大地的方形广场。北部高于南部。这种设计显示天在上,地在下,反映了中国古代人民“天圆地方”的思想。两层围墙把天坛分为内坛和外坛。天坛的主体建筑位于内坛中轴线的南北两端。最宏伟的建筑物从南到北依次是圜丘坛、皇穹宇和祈年殿。还有其他的建筑物,如三音石和回音壁。圜丘坛是三层汉白玉构成的平台。在明朝时期(公元1368年~公元1911年),皇帝将在每年的冬至祭天。此仪式是为了感谢上天并祈愿将来一切都好。祈年殿是一座大殿,圆顶,有三层屋檐。祈年殿屋顶都铺上了黑色、黄色和绿色的琉璃瓦,象征着天、地和地上的万物。天坛另一个重要的建筑是皇穹宇。如果从远处看,你会发现皇穹宇像一把蓝伞。它的结构和祈年殿类似,但规模较小,由砖和木材构成,并被白色大理石栏杆围绕着。三音石位于皇穹宇的门外。如果你面向皇穹宇说话,站在第一块石头上,将听到一声回音;站在第二块石头上,将听到两声回音;站在第三块石头上,将听到三声回音。另一个有趣的著名的地方是别具一格的回音壁。它围绕着皇穹宇,周长为193米。如果你和你的朋友站在东西墙,当你小声说话时,你的朋友会很清楚地听到你所说的话。难道不是很有趣么?这一现象利用了声波原理。