From every elevated point say Allaahu 'Akbar (Allah is the Most Great) three times and then recite:
217. Laa 'ilaaha 'illallaahu wahdahu laa shareeka lahu, lahul-mulku, wa lahul-hamdu, wa Huwa 'alaa kutti shay 'in Qadeer, 'aa'iboona, taa'iboona, 'aabidoona, lirabbinaa haamidoona, sadaqallaahu wa'dahu, wa nasara 'abdahu, wa hazamal-'ahzaaba wahdahu.
None has the right to be worshipped but Allah alone , Who has no partner . His is the dominion and His is the praise , and He is Able to do all things. We return repentant to our Lord, worshipping our Lord , and praising our Lord . He fulfilled His Promise, He aided His slave, and He alone defeated the Confederates.
Reference: Bukhari 7/163, Muslim 2/980. The Prophet (SAW) used to say this when returning from a campaign or from Hajj.