Where can Americans travel in Europe?

While the news of Europe's gradual reopening to American travelers is causing excitement among travel advisors and their clients, the lack of unity and clarity on the rules has translated into headaches for those who are anxious to start planning.

One thing we do know so far is that the welcome mat is being extended most enthusiastically to vaccinated travelers, and that testing is still required in some countries even with proof of vaccination. And a Covid test is still required of any traveler entering, or re-entering, the U.S.

Travel to Albania

Albania is an outlier among other European destinations in that all U.S. travelers are welcome with no testing or quarantine requirements.

There is, however, a curfew from 10 p.m. to 6 a.m., and masks are required in indoor public spaces for anyone over the age of 11. Travelers should take note that noncompliance for mask wearing can result in a fine.

Travel to Austria

There are hints of a mid-June date but nothing has been confirmed yet.

Once the country is open, travelers will be required to present one of three documents: proof of Pfizer, AstraZeneca, Johnson & Johnson, or Moderna vaccination; proof of recovery from a Covid infection; or proof of a negative Covid test (either a negative PCR test no older than 72 hours or an antigen test no older than 48 hours from departure).

Travel to Croatia

Visitors need proof of vaccination; a negative PCR test no older than 72 hours or an antigen test no older than 48 hours; or of proof of recovery from a Covid infection.

Also, tourists are required to book and pay in full for accommodations in advance of arrival and have documents to prove it, according to Wanda Radetti, the founder and president of Tasteful Croatian Journeys, adding that Tasteful Croatian Journeys will prepare the necessary documents for its guests.

Masks are required indoors and on public transportation, and nightclubs are closed.

Travel to Denmark

Fully vaccinated visitors (Moderna, Pfizer, AstraZeneca or Johnson & Johnson) from the U.S. can enter Denmark for tourism without testing or quarantine requirements if they present proof of vaccination and at least two weeks have passed since their final dose.

Unvaccinated children traveling with vaccinated adults may also enter but will need to be tested on arrival, depending on their age.

Travel to Finland

Americans are still restricted from entry to Finland until at least June 27, according to VisitFinland. For the latest information on the opening date and anticipated entry requirements, see its Covid-specific site.

Travel to France

As long as they received Moderna, Pfizer, AstraZeneca or Johnson & Johnson vaccines at least two weeks before arrival. They also need to present a negative PCR test of less than 72 hours or a negative antigen test of less than 48 before boarding.

No quarantine on arrival is necessary for travelers who meet these conditions.

Unvaccinated children will be allowed in with vaccinated adults but will have to show a negative test. But unvaccinated adults need a so-called compelling reason to visit and will need to quarantine on arrival.

Masks are required in public venues, and fines may be levied for noncompliance.

A visits to a museum or monument should be organized quite in advance because of certain visiting restrictions -- the number of people at the same visiting slot, social distancing and the like.

For more entry specifics, visit the Foreign Ministry site and click on "Can I Enter France."

Travel to Germany

Once open, individual states in Germany may have their own testing and mask protocols, but in general, expect to wear a mask on public transportation.

Travel to Greece

Visitors must provide proof of vaccination or a negative Covid PCR test.

Children 5 and younger can enter without restrictions when accompanied by adults who meet the requirements.

A curfew is in place from 1:30 a.m. to 5:00 a.m. Restaurants and attractions are open, but size and capacity restrictions are in place. Expect to wear masks indoors and in some outdoor locations.

Travel to Iceland

Travelers who have been vaccinated or who can show proof of prior infection have been able to enter the country without testing or quarantining since April.

There are no curfews, but masks are required on public transportation, with fines enacted for noncompliance.

Travel to Ireland

Will begin welcoming U.S. tourists, vaccinated or not, on July 19.

Those who can provide proof of vaccination can skip the testing and quarantine rules. Unvaccinated travelers or those wishing to travel before July 19 will be required to present a negative Covid test taken within 72 hours and quarantine for 14 days upon arrival.

There are no curfews in place, but masks are required on public transportation, indoors and outside where social distancing is not possible.