We look up to them when Big Boy starts using irons, leaving small dents (4, 9)
Tall buildings
big = tall, boy = b, starts using irons leaving = uil, small dents = dings

1S E 2R V 3E 4P L 5A Y 6G R 7O U 8N D
T E V E S I U E
9E I F F E L T O W E R 10N E W T 11S
E I N R I D C Y T
12L I N K 13C O N C R E T E 14O O P
E N K R S R E
15T O D E 16M E A N 17A S K 18S K I T
O A S 19M 20T S E
21W O 22R L D 23T R A D E C E N T E R
E E O L M S
24R O S S 25A 26W H A R 27F 28P E 29T E R
I T T E Y I E I O
30N O R E T U R N S 31F I R E A R M
G A I S I T E R E
32S P A C E 33C A T H E D R A L

AcrossDown
1 First hit, then shatter, poem (5)
serve = shattered poem (verse)		 1 Middle East allows reversed iron alloy (5)
allows = lets, reversed = stel with e in middle = steel
4 Angry, proud, and mixed up, I exchange rights and lefts on the recess field (10)
playground = angry + proud rearranged, with a r exchanged for an l 		2 Removed impurities from Shark's calling card in the tall grass (7)
refined = fin (Shark's calling card) in reed (tall grass)
9 Gustav's masterpiece in Greece - if felt, owe romans homage (6, 5)
in greecE IF FELT OWE Romans homage		 3 Fair and flat (4)
even = flat and fair
10 A cross in the news resembles lizards (5)
newts = a t (cross) in news		 4 Malaysia's famous pair split roses, pear, town, tea (8, 6)
rearrange roses pear town t
12 Left? Write? What's the connection? (4)
link = l (left) + ink (write)		 5 English grange as candle center (6)
aswick = as + wick (candle center)
Sorry, I know this one is obscure
13 Real prisoner on mediterranean island (8)
con = prisoner + crete = med. island		 6 Horizontal supports started glowing iris red, described every returning steelworker (7)
start Glowing Iris Red Described Every Returing Steelworker
14 Just one mistake ends coop (3)
ends coop = oop (mistakes are oops, so ONE mistake is ?)		 7 Less than pounds, it finishes jumping up and down (6)
finshes jumping up and down = finishes bounces = ounces
15 Before Delaware intends to criticize (2, 6)
Delaware = DE, intends = mean 		8 Inside its nest, the ambidextrous yolk wins a big apple holder (3, 4, 2)
wins = w, ambidextrous yolk = york (switching right and left)
put wyork inside nest = new york st
17 Question as strikeout? (3)
as k (strikeout)		 11 In front of sellers, state more disruption in Cardinal's home (2, 6, 4)
sellers = peters, state = st, more disruption = rome
18 Sketch kits in bits (4)
kits in bits = skit		 15 Imposing pull, behind emergency room in Germany (8)
pull behind = tow, emergency room = er, in germany = ing
21 Place origin after global exchange of Manhattan's twins (with 23 across) (5, 5, 6)
origin = center, global = world, exchange = trade		 16 Sam Adams lager has crazy inclinations (3)
saM ADams literally has "mad"
23 see 21 across 19 I hear about disease and a country in Asia (9)
disease and a = malaise a = malaysia
24 Red Roman with broken oar surrounds Nazi security force (5)
Nasi security force = ss, broken oar surrounds ss = rossa
= red in Italian		 20 Anger a talking horse to become tougher (8)
Anger = temper, a talking horse = ed
26 Boats come to this Western half of harbor, ignoring remainder of fleet (5)
Western = w, half of harbor = har, ignore remainder of fleet = f		 22 Buckle up again - relax before finishing trap (7)
relax = rest, finshing trap = rap
28 Pan and slowly fade away (5)
Peter Pan, slowly fade away = peter out		 25 Upstairs ocean missing an l (5)
ocean = atlantic, missing an l = attic
30 Referenda votes against nurses following breakdown on 4/5s of truce (2, 7)
nurses = rns, 4/5s of truce = true, rearrange (breakdown)
on true = no retu with rns (nurses) following		 27 20% of a normal whiskey bottle (5)
20% = 1 fifth, whiskey bottle = a fifth
31 Weapon says to hold firm around the ear (7)
firm around ear = firearm		 29 Bejeweled headband worn by a sun god after it was returned (5)
a sun god = a ra, after it returned = ti, tiara
32 Room at the baths begins cold and empty (5)
baths = spa, begins Cold and Empty = ce		  
33 A cart held pieces of a church (9)
a cart held rearranged = cathedral