Five days of talks, ritual, music and gathering, with a special event on Thursday 13 May, Beyond the Self: Accessing the heart of the world.
Poseidonion Grand Hotel, Spetses, Greece · 10–14 May 2027
Live the retreat from within, with a few extra treats.
Share a room and each of you saves more than €1,000. Some experiences are meant to be lived side by side.
Prices are per person for the full five days and include VAT, four nights with breakfast, all meals and the Resident Pass. Accommodation and meals are provided and invoiced by the Poseidonion Grand Hotel; One Sanctum collects payment on the hotel's behalf.
Greece's climate resilience fee is not included. It is charged per room per night under Greek law and paid by you directly to the hotel at check-out.
Payment plan: a 30% deposit when you book, then two equal instalments on 15 January and 15 March 2027, taken automatically from the same card. The payment plan adds 5% to the price.
Booking from 14 January 2027? The payment plan becomes two instalments: 50% when you book and 50% on 15 March 2027, taken automatically from the same card (5% instalment fee included).
Deluxe Garden, shared · Deluxe Garden, single · Superior Garden, shared · Superior Garden, single · Sea View & Tower, shared · Sea View & Tower, single
Suites, apartments and other room categories at the Poseidonion may be available on request, including the 1 Bedroom Suite, La Cupola Suite, the Pool Suite and family apartments. Please write to us and we will find the right fit.
info@onesanctum.org5 days, lunch included. Full programme, including Thursday. Accommodation and dinners are not included.
Student / Practitioner Retreat Pass: €950, lunch included. See pass details.
€1,750 today
€2,250 starting 1 January 2027.
€920 today · €920 on 15 March 2027, taken from the same card. Paying in two instalments adds 5% (€1,840 in total).
Starting 1 January 2027, the regular pass price is €2,250, plus 5% for two instalments.
Secure card payment. All prices per person, VAT included.
All prices are per person and include VAT. Lunch is included in the Retreat Pass.
A limited number of places are available for students and practitioners at €950, including lunch.
To apply, email us with proof of eligibility, such as a student card or evidence of your professional practice. Once we confirm your place, payment is by bank transfer. You may pay in full, or in two instalments of €500 (the two-part option adds 5%). The first instalment is due when your place is confirmed, and the second by 15 March 2027. If you book after 15 March, the full €950 is due at once.
info@onesanctum.orgAccessing the heart of the world
Expanded states: applications for mental health and collective recovery
A day of conversations on medicine for our times: psychedelic research, ancient ways we can learn from, ethics, the edge of life, and everything in between. The first day of its kind in Greece.
The Thursday programme is included in the five-day passes (Resident & Retreat Pass).
A limited number of student/practitioner Day Passes are available at €350. Please write to us and include proof of eligibility, such as a student card or proof of your professional practice.
Book Your Day Pass →Booking is direct: choose your pass above and pay securely online. Write to us here about suites, student/practitioner places, dietary or accessibility needs, or any question at all. We read each note personally and reply within two working days.
Your message has reached us. We will reply within two working days. In the meantime, if anything urgent arises, please write to info@onesanctum.org.
We warmly encourage every guest to take out travel insurance that covers cancellation, ideally with "Cancel For Any Reason" (CFAR) cover, so that your travel and booking are protected whatever life brings.
Due to the structure of our event and the many moving parts that make it a singular experience, we are not able to issue refunds for registrations. We understand that life happens, so to accommodate change, registrations are transferable.
Please write to us at least seven days before the start of the event for any transfer requests. Thank you for your understanding.
With love, The One Sanctum Team
If you are reading this, something has brought you here. We trust that. We build these gatherings for the people who feel the pull, and we look forward to meeting you on Spetses.
Give any sum you wish towards a place on Spetses for someone who could not otherwise come. Your gift goes to those who ask us for sponsorship to attend.
Offer Your GiftSeeking sponsorship yourself? Write to us at info@onesanctum.org.