New Revised Standard Version
The people of Israel secretly did things that were not right against the LORD their God. They built for themselves high places at all their towns, from watchtower to fortified city;

Contemporary English Version
Even worse, the Israelites tried to hide their sins from the LORD their God. They built their own local shrines everywhere in Israel--from small towns to large, walled cities.

New American Bible
They adopted unlawful practices toward the LORD, their God. They built high places in all their cities, from guard post to garrisoned town.

Douay-Rheims Bible
And the children of Israel offended the Lord, their God, with things that were not right: and built them high places in all their cities, from the tower of the watchmen to the fenced city.

And the children of Israel offended the Lord, their God, with things that were not right: and built them high places in all their cities, from the tower of the watchmen to the fenced city.

secretly

Deuteronomy 13:6 If thy brother the son of thy mother, or thy son, or daughter, or thy wife that is in thy bosom, or thy friend, whom thou lovest as thy own soul, would persuade thee secretly, saying: Let us go, and serve strange gods, which thou knowest not, nor thy fathers,

Deuteronomy 27:15 Cursed be the man that maketh a graven and molten thing, the abomination of the Lord, the work of the hands of artificers, and shall put it in a secret place: and all the people shall answer and say: Amen.

Job 31:27 And my heart in secret hath rejoiced, and I have kissed my hand with my mouth:

Ezekiel 8:12 And he said to me: Surely thou seest, O son of man, what the ancients of the house of Israel do in the dark, every one in private in his chamber: for they say: The Lord seeth us not, the Lord hath forsaken the earth.

from the tower

2 Kings 18:8 He smote the Philistines as far as Gaza, and all their borders, from the tower of the watchmen to the fenced city.

Hosea 12:11 If Galaad be an idol, then in vain were they in Galgal offering sacrifices with bullocks: for their altars also are as heaps in the furrows of the field.