I paid inheritance tax to the state of Pennsylvania, is there anywhere to put that on the 2018 1040?

"is there anywhere to put that on the 2018 1040?"

No. State inheritance tax paid is not deductible on your federal income tax return. 

See https://www.irs.gov/taxtopics/tc503

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State  Inheritance Tax, and Federal or State Estate Tax, are not a part of the Income Tax system.  

TurboTax only supports Income Tax filings.
Inheritance Taxes and Estate Taxes are not allowable deductions, in general, on Income Tax filing

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The ONLY STATES with INHERITANCE TAX on bequests to beneficiaries are:

• Iowa           - no tax assessed if decedent's estate is under $25,000
• Kentucky
• Maryland    -lowest top  tax inheritance tax rate pf 10%; small estates of under $30,000 exempt
• Nebraska   -highest  top tax inheritance tax rate pf 18%
• New Jersey
• Pennsylvania

All six states exempt spouses, and depending on state, exemption varies for immediate relatives.