It really depends on what group of pagans. For the most part, they're can't really be much of a link. We know very little about many aspects of ancient European paganism, especially non-Roman or Greek religions. Some neo-pagans are historical reconstructionists, that is, they attempt to remain as close to the traditions of ancient religions as they can. Unfortunately, we really know very little, especially about such religions like ancient Celtic polytheism, which happens to be very popular among neo-pagans.

Other modern pagan groups, like Wiccans, have a much looser connection to ancient paganism and a more contemporary take on the religion.

The connection between modern paganism and early or pre-Christian paganism are virtually non-existent. As a practicing Druid, this is something that people in my spiritual community deal with often. Most modern pagans, or Neo-pagans, are very comfortable with forging new paths and not attempting to be like the pagans of old, but there are many reconstructionists out there as well.

In the case of Druidry specifically, we really know very, very little about the early Druids. Modern Druids take inspiration from the idea of Druidry, attempt to learn as much as we can about early Druids, but ultimately we are nothing alike. Druids and other Neo-pagans that claim association or ownership to Stonehenge don't have strong evidence to support them, as far as I'm aware.

Just a reminder that even on controversial issues like these, our rules still apply. We require answers to be in-depth and scholarly, and while mentioning your personal experience is fine, it can not be the core or only part of your answer.

Also remember that this is a subreddit for history and modern use of history, which means that there should always be a historical component to both questions and answers. Just talking about what current-day pagans do is not enough.

I think the closest links are in traditional holidays that were co-opted/preserved as christian feast days, but in recent years have gone back to their earlier, more pagan, roots.

The most important Latvian festival is called Jāņi (pronounced "YAH-nyih"). It is celebrated on the evening of June 23rd, which is the eve of St. John's Day (June 24th). It was very obviously a pagan celebration of the summer solstice (June 21st), but was probably associated with the feast of St. John the Baptist after the introduction of Christianity.

http://www.latvianstuff.com/Jani.html

In the Baltic, folk lore, nationalism, and the old pre christian religion are all tied closely together. That has helped to preserve the pagan traditions there.