Handicap passes

I am asking about parking pass. In the US there are generally parking spaces marked for those who have difficulty walking.

It's called a "blue badge", and allows the car to be parked in disabled parking places and in some cases on streets where parking is otherwise not allowed. There is a common scheme throughout the EU, so identical badges are issued by all EU countries which are recognised in all EU countries (don't ask what will happen after BREXIT).
You don't say where you come from, but generally non-EU badges are not recognised. You may be lucky and not get a ticket, or you may be unlucky.

Some info here: https://en.wikipedia.org/wiki/Disabled_parking_permit#European_Union
The UK government website to apply for a badge is here, but it is for UK residents only: https://www.gov.uk/apply-blue-badge

I hope you are not planning to drive in Paris or London. That is not sensible. Parking (disabled or otherwise) is very limited, and most of the tourist sights do not have any parking.

In previous questions regarding this, and some cursory research, the answer seems to be if you bring your placard from the US and attempt to use it in Europe, you Might be OK. Within the EU there are reciprocity agreements that allow member states to recognize each others placards, but that does not necessarily extend to other countries. Also a slight wrinkle, in the US, placards are issued and controlled by States, in Ireland and the UK at least, they are handled by the equivalent of non-profits, so standards are a bit different for issuing them.

The bottom line is that while there has been some effort to accept placards universally, it has not happened. Enforcement for the most part is up to local Police, they might figure good enough, or they might fine you.

Blue Badges are issued in the UK by the local Councils, with photos. Not non-profits.

There is usually a £10 charge, and criteria are strict. Application is made to Central Government who then pass the application to the Council where the person is resident for their adjudication.

Current criteria are (from a local council webpage):--

You automatically qualify for a Blue Badge if you’re aged two years (or older) and one of the following applies:

• You are registered as blind (severely sight impaired).
• You have either a Certificate of Vision Impairment (CVI) or a BD8 form, signed by a consultant ophthalmologist, stating that you are severely sight impaired (blind), and you wish to be registered as severely sight impaired (blind) with your local authority.
• You receive the Higher Rate of the Mobility Component of the Disability Living Allowance (DLA).
• You receive a Personal Independence Payment (PIP), and you meet a 'Moving Around' descriptor for the Mobility Component because you either cannot stand, or can stand but walk no more than 50 metres. This is a score of 8 points or more.
• You receive a War Pensioners' Mobility Supplement.
• You receive a tariff within 1-8 (inclusive) of the Armed Forces Compensation Scheme and have been assessed as having a permanent and substantial disability that causes inability to walk (or very considerable difficulty in walking).

In England, you might also qualify for a Blue Badge by being assessed by your local authority. You must be aged two years (or older) and one of the following must apply:

• You have a permanent and substantial disability which means that you are unable to walk.
• You have a permanent and substantial disability which means that you have very considerable difficulty in walking.
• You drive a vehicle regularly, and have a severe disability in both arms that means you are unable to operate all (or some types of) parking meter.
• You drive a vehicle regularly, and have a severe disability in both arms that means you have considerable difficulty operating all (or some types of) parking meter.

There are also special rules if you’re applying on behalf of a child under the age of three. You can get a Blue Badge if your child has a medical condition which means:

• Either: they must always be accompanied by bulky medical equipment,
• Or: they need to be kept near a vehicle in case they need emergency medical treatment